Consumers in Studentland buy Pizza and Pepsi nothing else. Prices and quantities are shown in the table below.

Year	Slices of Pizza	Price per Slice	Cans of Pepsi	Price per Can
2015	40	10	10	20
2016	60	12	20	24

The annual rate of inflation between 2015 and 2016 was

Select one:

A.20 percent.

B.67 percent.

C.100 percent.

D.60 percent.

E.40 percent.