A man walked diagonally across a square lot. Approximately, what was the percent saved by not walking along the edges?  Choose the correct choice from the following answers:
A) 20 %
B) 30 %
C) 40 %
D) 50 %
E) 55 %

Rationale: let the side of the square ( abcd ) be x metres . then , ab + bc = 2 x metres . ac = 2 x = ( 1.41 x ) m . saving on 2 x metres = ( 0.59 x ) m . saving % = ( 0.59 x ) / 2 x x 100 % = 30 % ( approx . ) b )
Answer: B