Book Maths Puzzle Numerical Ability Percentage

A no. Is by mistake divided by 5 instead of being multiplied by 5 wat is the % error
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Book Other Question

How Many Zeroes Will be there at the end of the expression (2!)^2! +(4!)^4! +(8!)^8! +(9!)^9! +(10!)^10! +(11!)^11! ? In a 100m race, A can beat B by 25m and B can beat C by 4m. In the same race, by how many meters can A beat C?