Sally estimated that her call would take twenty-one minutes but it actually took fifteen minutes. What was her percent of error?

A)twenty-one percent

B)twenty-eight point six percent

C)thirty-three point three percent

D)forty percent

Question

Sally estimated that her call would take twenty-one minutes but it actually took fifteen minutes. What was her percent of error? 

 A)twenty-one percent 

 B)twenty-eight point six percent 

 C)thirty-three point three percent 

 D)forty percent

directrix · Answer

@JulieeeXD

{ (21 - 15)/21 } * 100 =   ? %