Question

Misha's test score decreased from 80% to 60%. What was the approximate percent decrease of Misha's test score?

Answer 1

Hence, the percent decrease is:

25%

Explanation:

It is given that:

Misha's test score decreased from 80% to 60%.

We know that the percent increase or decrease in the test score is given as:

`Percent\ decrease=(New\ score-Old \ score)/(Old \ score)* 100`

Let the total score be'x'.

Hence,

`old\ score=(80)/(100)* x\\\\old\ score=0.8x`

similarly new score is:

`New\ score=0.6x`

Hence,

`Percent\ decrease=(0.8x-0.6x)/(0.8x)* 100\\\\=(0.2x)/(0.8x)* 100\\\\=(2)/(8)* 100\\\\=25\%`

Hence, the percent decrease is:

25%

Answer 2

% decrease = (old score - new score)/old score x 100 = (80 - 60)/80 x 100 = 20/80 x 100 = 25%