Campus Maths Puzzle Numerical Ability

a man walked diagonally across a lot approximately what was the energy saved by not walking across the edges?

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Campus Other Question

If the sum of the first 11 terms of an arithmetic progression equals that of the first 19 terms, then what is the sum of the first 30 terms? A wholesale cloth merchant buys a export surplus lot of cloth.he sells 33.33% of it at 20% and 37.5% of the remaning at a loss of 20%.What sholud be the mark up on the remaining cloth so that after giving a discount of 20% while selling ,the merchant gets a profit of 10% on the overall transcation?
A.50%
B.40%
C.25%
D.20%