Substitue I=100 r=0.01 t=1/2 into the formula for simple intrest and solve for P
I=Prt
100 =P(0.01) (1/2)
100= P(0.05)
2,000=P multiply and solve for p
I know how to get everything but the 2,000. Need the forumla on what they are multiply and how they are multiply to get the 2,000

- anonymous

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- myininaya

let see you divided both sides by 0.05 giving you 100=P*(1/100)(1/2)
100=P*(1/200)
2000=P by multiplying 200 on both sides

- anonymous

still kinda lost sorry

- anonymous

or what would problom look like when divied

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## More answers

- myininaya

do you know .01=1/100?

- myininaya

Examples: 1/10=.1, 1/100=.01, 1/1000, .001, 1/10000=.0001 so on....

- anonymous

yea i know that

- myininaya

ok do you know how to multiply 1/100 * 1/2

- myininaya

=(1*1)/(100*2)=1/200

- myininaya

to multiply fractions you multiply straight across on the numerator and then for the denominator like I did above

- myininaya

Since we are trying to get P by itself and it is being multiplied by that 1/200 to undo this multiplication we multiply by the multiplicative inverse of 1/200 to get the multiplicative identity 1. The multiplicative inverse of 1/200 is just its reciprocal which is 200. So we multiplied by 200 to get the multiplicative identity. The multiplicative identity times any number will be that number since the multiplicative identity is 1. But since we multiply 200 on one side we have to do it to the other side of the equation

- myininaya

any questions?

- anonymous

nope thanks alot

- myininaya

really you're good?

- myininaya

isn't the word multiplicative cool?

- myininaya

say yes. you know you want to

- anonymous

yes

- anonymous

lol, random

- myininaya

i had the hardest time saying that word, and I finally got it. I used to couldn't say it

- anonymous

lol
well not really i man i kinda get the problem but i mean

- myininaya

I like to change everything to fractions, but you could have left it "deciamly"

- myininaya

decimaly*

- anonymous

yea i show you next problem and then show you what i think then can maybe walk me throw it lol
like i have done others on here before lol

- anonymous

i will show you problem

- myininaya

k bring it

- anonymous

there is a screen shoot of the problem

##### 1 Attachment

- anonymous

i know that the fraction will be 3/4

- anonymous

because 9/12=0.075 wich is 3/4 in fraction

- myininaya

are you talking about your P is 3/4? If so, then thats incorrect

- anonymous

so i will take 0.04 (3/4)

- anonymous

t

- anonymous

becasue be 9 /12

- myininaya

Our formula for interest is I=Prt where r=4% and t=9 and I=42 and they ask us to solve for P. Let me see you plug those in

- anonymous

okay give me sec

- myininaya

k

- anonymous

I=42,r=0.04,and t=9/12=3/4 thats what i got so far

- anonymous

and in terms i will have

- anonymous

I=prt
42=(0.04)(3/4)
42=P(0.03)
then how will i caculate to get P

- myininaya

I thought t=9? let me look again

- myininaya

t=9 not 3/4

- anonymous

i will show you an exapmle it gives me how to do problem

- anonymous

same problem with exapmle beside it

##### 1 Attachment

- anonymous

but say's got to divide 9 by 12 months

- myininaya

oh i didnt see the month thing sorry

- myininaya

yes there are 12 months so the time will be 9/12 gj

- anonymous

wich means will be 0.075 in dec and 3/4 in fraction

- myininaya

3/4=.75

- anonymous

yea

- anonymous

I=prt
42=(0.04)(3/4)
42=P(0.03)
do i got to divide the 0.04 and (3/4)

- myininaya

yes so far correct

- anonymous

but if i divide i will get 0.05

- anonymous

if i divide 0.04 and 3/4

- anonymous

get 0.05 right

- myininaya

since we should be multiplying those we get .03

- anonymous

all i get it

- anonymous

now thats so crazy lol

- anonymous

then i take 0.03/42 and that =P

- anonymous

i mean *

- myininaya

42/.03

- anonymous

=140

- anonymous

thats crazy i been working on problem couple days and all i need to do lol

- myininaya

1400

- anonymous

i knew how to work problem

- anonymous

thanks for all your help man thanks alot

- myininaya

ur welcome

- anonymous

maybe can help me with couple more

- anonymous

i wirked on i got most of problem but can figure certin ones out

- anonymous

parts of them

- myininaya

k

- anonymous

##### 1 Attachment

- anonymous

like i get
33.25
______
1900 (3/13)
make r=

- anonymous

3/12

- myininaya

yes looks good

- myininaya

the first one does. did you want me to check the other two or something?

- myininaya

what was your strategy for the next one?

- anonymous

the frist two are good what i am having trouble with is the intrest rate

- anonymous

actual intrest

- myininaya

what is the formula for actual interest?

- anonymous

look at the example shows how to get the actual interrest

##### 1 Attachment

- anonymous

i know how to do problem but like when i divide then top by botton and add the bottem times ther fraction not sure i am doing ti right

- myininaya

so r=I/(Pt)=33.25/(1866.75*3/12)

- myininaya

i will bbl maybe

- anonymous

lol

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