Question

Billy bought a comic book for $2.25. now it's a collectors item worth $20. What was the increase in price? round to the nearest hundredth percent.

Answer 1

So you're looking for some x, multiplied by the original price, to get to the new price.
Therefore you have...
(2.25)x = 20
Solve for x and you get 8.8889. Change this into a percentage and you get 888.89%