percent increase or decrease : before 40 after 65 what are the steps to do this i forgot???

- anonymous

percent increase or decrease : before 40 after 65 what are the steps to do this i forgot???

- chestercat

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- karatechopper

amount of change/ original

- karatechopper

so it would be 65-40/40

- anonymous

so its 40/65??

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## More answers

- karatechopper

15/40

- karatechopper

simplify that..3/8

- karatechopper

use a calculator...

- karatechopper

3/8=0.375
move decimal 2 steps to right
37.5% increse

- anonymous

8/13????

- karatechopper

nooo

- karatechopper

lets take this step by step k?

- anonymous

ok

- karatechopper

so the formula is
change in amount/ orginal

- karatechopper

so the change in amount is the change between 65 and 40
so 65-40/original

- karatechopper

and the original is 40, because u said before.

- karatechopper

so now the equation is 65-40/40

- karatechopper

so if u simplify that... it is 15/40

- karatechopper

and if i simplify that to work with better, it becomes 3/8

- karatechopper

then i use the calculator asking what 3/8 is..

- karatechopper

it says 3/8=0.375

- karatechopper

and since u are looking for percent i move the decimal 2 steps to the right.

- karatechopper

so not 3/8= 37.5%

- karatechopper

and if u are counting from 40 to 65, u are INCREASING your count...

- karatechopper

therefore it is a 37.5% increase

- karatechopper

get it?

- anonymous

im stuck at where i subtract then what do i do?

- anonymous

Percentage Increase or Decrease
\[=\frac{amount.of.change}{original.price} \times100\]\[=\frac{NP-OP}{OP} \times 100\]
where NP is your new price and OP is the old price

- anonymous

so in your question what was the old price and what was the new price?

- anonymous

40 old price new price 65

- anonymous

okay good so OP=40 and NP=65. try and put these values into the equation i gave above and what answer do you get?

- anonymous

so i subtract 65 -40 and i get 25 then what do i do multiply with 100?

- anonymous

well let's multiply by 100 last because all that does is change our answer to percentage. so you have 25 now you need to divide by the original price

- anonymous

0.625 i got

- anonymous

good now the last step is to times by 100

- anonymous

62.5

- anonymous

perfect so your answer is 62.5%

- anonymous

so how do i know if its increasing or decreasing?

- anonymous

if the percentage is positive it's increasing if it's negative it's decreasing

- anonymous

thanks!!!!!!!!!! ALOT!

- anonymous

no worries (:

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