A student multiplied a number by 3/5 instead of 5/ What is the percentage of error in the calculation?

A student multiplied a number by 3/5 instead of 5/ What is the percentage of error in the calculation?

A 34%

B 44%

C 54%

D 64%

Solution

Correct Answer: Option D

Error %= error / true value

but, here.. error= true value-false value

ie., error=(5/3)-(3/5)=16/5

so the error % will be equal to (16/5)/(5/3)=64%

(since, true value is 5/3)