Question

What is the percent of increase from 50 to 90?

A.
40%

B.
44%

C.
56%

D.
80%

Answer 1

$percent \ increase= \frac{new \ value-old \ value}{old \ value} \times 100 \% \\ = \frac{90-50}{50} \times 100 \% \\ = \frac{40}{50} \times 100 \% \\ =80\%$