Book Maths Puzzle

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

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Book Other Question

270 students appeared for an examination, of which 252 passed. What is the pass percentage? In an examination, 5% of the applicants were found ineligible and 85% of the eligible candidates belonged to the general category. If 4275 eligible candidates belonged to other categories, then how many candidates applied for the examination?