The Table Below Shows Hypothetical Monthly Cell Phone Plan Fees

Multiple Choice

The table below shows hypothetical monthly cell phone plan fees for the identical service over several years. TABLE 2-2 Refer to Table 2-2.Assume that 2015 is used as the base year,with the index number = 100.Which of the following series is the correct set of index numbers for the monthly cell phone charges from 2015 to 2019?

A) 0.55; 0.50; 0.40; 0.35; 0.25
B) 100; 91; 73; 64; 45
C) 55; 50; 40; 35; 25
D) 1.0; 0.91; 0.73; 0.64; 0.45
E) 100%; 91%; 73%; 64%; 45%