A man walked diagonally across a square lot. Approximately, what was the percent saved by not walking along the edges?

Answer: Option C

Let the side of the square(ABCD) be x metres.
Then, AB + BC = 2x metres

AC =$$\sqrt{2}$$ x = (1.41x) m
Saving on 2x metres = (0.59x) m
$$\begin{array}{rl}& \text{Saving}\%=\left(\frac{0.59x}{2x}\times 100\right)\%\\ & =30\%\left(\text{approx}\right)\end{array}$$