A student multiplied a number by 3/5 instead of 5/3. What is the percentage error in the calculation?  Pick one.
A) 54  B) 48  C) 65  D) 25  E) 64

Rationale: let the number be x . then , error = 5 / 3 x - 3 / 5 x = 16 / 15 x . error % = ( 16 x / 15 * 3 / 5 x * 100 ) % = 64 % answer e ) 64 %
Answer: E