The Table Below Shows Hypothetical Prices for a Particular Anatomy

Multiple Choice

The table below shows hypothetical prices for a particular anatomy textbook at a university bookstore over several years.
TABLE 2-4
-Refer to Table 2-4.Assume that 2012 is used as the base year,with the index number = 100.The value of the index number in 2015 is calculated as follows:

A) 215/180 = 1.194.
B) 180/215 = 0.837.
C) (215/180) × 100 = 119.4.
D) (180/215) × 100 = 83.7.
E) (215 - 180) = 35.