Question

Eduardo says that an increase from 10 to 40 is 300% therefore a decrease from 40 to 10 must be a 300% decrease do you agree with eduardo explain your reasoning

Answer 1

Eduardo's second statement is wrong.

Explanation:

Eduardo says that an increase from 10 to 40 is 300% which is true. Because there is an increase by (40 - 10) = 30 and the percent of increase is calculated with respect to 10.

So, % of increase =
`(30 * 100)/(10) = 300`%.

But when we consider a decrease from 40 to 10, then the decrease is by (40 - 10) = 30, but the percent of decrease will be calculated with respect to 40.

Therefore, the % decrease =
`(30 * 100)/(40) = 75`%.

Hence, Eduardo's second statement is wrong. (Answer)