1)

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


A) 65%

B) 68%

C) 70%

D) 72%

E) 64%

Answer:

Option E

Explanation:

Let number be x
Actual number =5x3 and error number =3x5
Error = 5x33x5=16x15
Error % = 15(5x3)×100
= 64%