Question

How do you find the new amount given 80 members decreased by 65%?

Answer 1

See a solution process below:

Explanation:

We can write an equation for this problem as:

`n = m + (m * r)`

Where:

`n` is the new number of members. What we are solving for.

`m` is the original number of members. 80 for this problem.

`r` is the rate of change in membership. -65% for this problem because there was a decrease in the number of members. "Percent" or "%" means "out of 100" or "per 100", Therefore -65% can be written as `-65/100`.

Substituting and calculating `n` gives:

`n = 80 + (80 * -65/100)`

`n = 80 + (-5200/100)`

`n = 80 + (-52)`

`n = 80 - 52`

`n = 28`

There are now 28 members.

Answer 2

`28` members

Explanation:

If there is a decrease of `65%` , it means that `100%-65% = 35%` of the members are left.

So we just need to find `35%` of 80.

`35/100 xx 80 = 28` members.

The other way is to find the actual decrease, which is:

`65/100 xx 80 = 52` members

`80-52 = 28` members remain.