Question

What is the percent of increase from 50 to 90?

A.
40%

B.
44%

C.
56%

D.
80%

Answer 1

percent increase is given by
\[\frac{ \text{ new } -\text{ old }}{\text{ old } } \cdot 100 \text{ %}\]

Answer 2

so i divide

Answer 3

nvm i dunno anymore I DONT KNOW LIFE

Answer 4

what u mean

Answer 5

do what freckles says first!

Answer 6

no @dan815 your way was good to
\[A=\frac{ \text{ new }- \text{ old }}{\text{ old }} \\ A=\frac{ \text{ new }}{\text{ old }} -1 \\
A+1=\frac{\text{new }}{\text{ old } } \\ \]
\[\text{ old } (A+1)=\text{ new }\]
Where your I=A+1

Answer 7

too!*

Answer 8

One more way for you

50+x% of 50 = 90
50+x/100 * 50 = 90
50*(1+x/100)=90
solve for x

2 moar way for you

50*R=90
r=90/50
r=1+k
90/50 = 50/50 + 40/50
=50/50 + 80/100
^----- 80%! increase voila

Answer 9

a 40