A store increases the price of a sweater from $20 to $22. What is the percent of increase? Select from the drop-down menu to correctly complete the statement.

a 0.1

b 0.2

c 2

d 9

e 10

f 20

The percent increase can be solve by using the formula:

F = P (1 + i)

Where F is the new prize of the sweater

P was the old prize of the sweater

i is the fraction increase of the price of the sweater

22 = 20 (1 + i)

So i = 0.1

So the percent increase is 0.1 x100 = 10 %