anonymous
  • anonymous
percent increase or decrease : before 40 after 65 what are the steps to do this i forgot???
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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karatechopper
  • karatechopper
amount of change/ original
karatechopper
  • karatechopper
so it would be 65-40/40
anonymous
  • anonymous
so its 40/65??

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karatechopper
  • karatechopper
15/40
karatechopper
  • karatechopper
simplify that..3/8
karatechopper
  • karatechopper
use a calculator...
karatechopper
  • karatechopper
3/8=0.375 move decimal 2 steps to right 37.5% increse
anonymous
  • anonymous
8/13????
karatechopper
  • karatechopper
nooo
karatechopper
  • karatechopper
lets take this step by step k?
anonymous
  • anonymous
ok
karatechopper
  • karatechopper
so the formula is change in amount/ orginal
karatechopper
  • karatechopper
so the change in amount is the change between 65 and 40 so 65-40/original
karatechopper
  • karatechopper
and the original is 40, because u said before.
karatechopper
  • karatechopper
so now the equation is 65-40/40
karatechopper
  • karatechopper
so if u simplify that... it is 15/40
karatechopper
  • karatechopper
and if i simplify that to work with better, it becomes 3/8
karatechopper
  • karatechopper
then i use the calculator asking what 3/8 is..
karatechopper
  • karatechopper
it says 3/8=0.375
karatechopper
  • karatechopper
and since u are looking for percent i move the decimal 2 steps to the right.
karatechopper
  • karatechopper
so not 3/8= 37.5%
karatechopper
  • karatechopper
and if u are counting from 40 to 65, u are INCREASING your count...
karatechopper
  • karatechopper
therefore it is a 37.5% increase
karatechopper
  • karatechopper
get it?
anonymous
  • anonymous
im stuck at where i subtract then what do i do?
anonymous
  • 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
  • anonymous
so in your question what was the old price and what was the new price?
anonymous
  • anonymous
40 old price new price 65
anonymous
  • 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
  • anonymous
so i subtract 65 -40 and i get 25 then what do i do multiply with 100?
anonymous
  • 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
  • anonymous
0.625 i got
anonymous
  • anonymous
good now the last step is to times by 100
anonymous
  • anonymous
62.5
anonymous
  • anonymous
perfect so your answer is 62.5%
anonymous
  • anonymous
so how do i know if its increasing or decreasing?
anonymous
  • anonymous
if the percentage is positive it's increasing if it's negative it's decreasing
anonymous
  • anonymous
thanks!!!!!!!!!! ALOT!
anonymous
  • anonymous
no worries (:

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