Question

The depth was 64 feet. Currently, the depth is 80 feet. by what percent has the depth increased?

Answer 1

The depth was 64 feet. Currently, the depth is 80 feet. The depth increased by 25%

Solution:

Given, The depth was 64 feet.

Currently, the depth is 80 feet.

We have to find by what percent has the depth increased

The percentage increase is given as:

`\text { percent increase }=\frac{\text { change in the depth }}{\text { original depth }} * 100 \%`

Here original depth = 64

Final depth = 80

Change in depth = final depth - original depth = 80 - 64 = 16

Plugging in values in formula we get,

`\begin{array}{l}{\text { Percent increase in depth }=(80-64)/(64) * 100 \%} \\\\ {=(16)/(64) * 100 \%} \\\\ {=(1)/(4) * 100 \%=25 \%} \\\\ {\text { Hence, the depth increased by } 25 \% .}\end{array}`