A student multiplied a number by 3/5 instead of 5/3, What is the percentage error in the calculation ? Options:  A) 22  B) 64  C) 365  D) 29  E) 36

Rationale: "let the number be x . then , ideally he should have multiplied by x by 5 / 3 . hence correct result was . by mistake he multiplied x by 3 / 5 . hence the result with error = then , error = error % = = 64 % answer : b"
Answer: B