The number of watches sold in Town Y in April is what percent more than the number of watches sold in Town X in the same month?

Answer: Option B

The number of watches sold in Town Y in April = 210
The number of watches sold in Town X in April = 150
Required percentage
$$\begin{array}{rl}& =\frac{210-150}{150}\times 100\\ & =\frac{60}{150}\times 100\\ & =40\%\end{array}$$