A New Computer System Reduced the Time for Printing the Payroll

Multiple Choice

A new computer system reduced the time for printing the payroll from 47 minutes to 27 minutes.
a) What is the amount of the decrease?
b) What percent decrease does this amount represent? Round your answer to the nearest percent.

A) a) 30 minutes; b) 85 $\%$
B) a) 20 minutes; b) 43 $\%$
C) a) 20 minutes; b) 85 $\%$
D) a) 30 minutes; b) 43 $\%$
E) a) 30 minutes; b) 4 $\%$