## anonymous 5 years ago percent increase or decrease : before 40 after 65 what are the steps to do this i forgot???

1. karatechopper

amount of change/ original

2. karatechopper

so it would be 65-40/40

3. anonymous

so its 40/65??

4. karatechopper

15/40

5. karatechopper

simplify that..3/8

6. karatechopper

use a calculator...

7. karatechopper

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

8. anonymous

8/13????

9. karatechopper

nooo

10. karatechopper

lets take this step by step k?

11. anonymous

ok

12. karatechopper

so the formula is change in amount/ orginal

13. karatechopper

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

14. karatechopper

and the original is 40, because u said before.

15. karatechopper

so now the equation is 65-40/40

16. karatechopper

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

17. karatechopper

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

18. karatechopper

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

19. karatechopper

it says 3/8=0.375

20. karatechopper

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

21. karatechopper

so not 3/8= 37.5%

22. karatechopper

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

23. karatechopper

therefore it is a 37.5% increase

24. karatechopper

get it?

25. anonymous

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

26. 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

27. anonymous

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

28. anonymous

40 old price new price 65

29. 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?

30. anonymous

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

31. 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

32. anonymous

0.625 i got

33. anonymous

good now the last step is to times by 100

34. anonymous

62.5

35. anonymous

36. anonymous

so how do i know if its increasing or decreasing?

37. anonymous

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

38. anonymous

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

39. anonymous

no worries (: