Match the information about interest earned with the principal amount invested. Remember the equation for calculating simple interest is I equals p times r times t . seventy-two dollars over 3 years at an interest rate of three percent sixty-six dollars over 2 years at an interest rate of three percent seventy-two dollars over 2 years at an interest rate of four percent seventy-two dollars over 3 years at an interest rate of two percent A. p equals nine hundred dollars B. p equals one thousand two hundred dollars C. p equals one thousand one hundred d

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Match the information about interest earned with the principal amount invested. Remember the equation for calculating simple interest is I equals p times r times t . seventy-two dollars over 3 years at an interest rate of three percent sixty-six dollars over 2 years at an interest rate of three percent seventy-two dollars over 2 years at an interest rate of four percent seventy-two dollars over 3 years at an interest rate of two percent A. p equals nine hundred dollars B. p equals one thousand two hundred dollars C. p equals one thousand one hundred d

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Did you try this?
the first one would be interest earned is 72, principal we have to find, rate is .03 and time is 3 years.
\[72=P(.03)(3)\]

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Other answers:

P=800
Why do you only have 3 answers for 4 problems?
I put the last one but it wont show it was ( D. p equals eight hundred dollars )
Can you try the next one and tell me what you get and I will check it.
66(.3)(2) i did this but i got 39.6 :\
\[66=P(.03)(2)\]\[\frac{66}{(.03)(2)}=P\] \[1100=P\]
am I adding the (.03) (2) together and then dividing it by 66?
No. Let's take some simpler numbers and see if you can understand. What if I have 12 = 2x Could you solve that? And how would you do it?
6 12 รท 2 = 6?
Yes. look at what I am going to draw.
|dw:1328200164853:dw|
So these equations that you have to solve are exactly like that.
do you have a calculator?
Yes
Write this down on a piece of paper; 66=P(.03)(2)
k
Now multiply .03 times 2
What did you get?
.06
So now write this: 66=P(.06)
k
Now divide both sides of the equation by .06 like I showed you in the drawing.
p = 1100
:D ahh i see
Very good. Now set up the next one and tell me how you set it up. NOT the answer, just the set-up.
ok
72 = P(.04)(2)
Perfect!! Now, can you solve it?
yes :D!
Great. Tell me what you get.
P = 800?
That's not what I got. You check your answer and I will check mine.
well i got 1800 = p but I did not know what to do with the (2) in 72 = P(.04)(2)
(.04)(2) means .04 times 2 so multiply them together first.
Then you should have 72=P(.08)
yes
Now divide both sides of the equation by .08
Like I showed you in the drawing.
p = 900
Bingo!!! Now try the last one.
And show me your setup
72 = P(.04)(2) .04 x 2 = .08 72 = P(.08) 1,900 = p that??
Well that is all perfect except when you divided both sides by .08 you must have hit a wrong button. So try the division part again.
Oh. just a minute. That is the same problem we just did.
oh you want the next?
Yes. The last problem.
The final problem in the list.
seventy-two dollars over 3 years at an interest rate of two percent 72 = P (.02)(3) 72 = P (.06) 1,200 = p
WOW!!! You are just too smart!
:D ty for teaching me!!!
yw
sorry i took so long to understand o.o
That's ok. We all have trouble with stuff. It's just not the same stuff for everyone.
thanks :)
yw

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