Question

Misha increased her test score from 60% to 80%. What was the approximate percent increase of Misha's test score?

Answer 1

This is one of those confusing questions, because they are mixing up percent increases of a number that is a percent. People often use this to confuse people about what is going on...

but to answer, think of 60% and 80% as 0.60 and 0.80
and use this idea:
\[ \text{percent change} = \frac{\text{ new value - old value}}{\text{old value}}\cdot 100 \]