The average sale of car dealership was 15 cars per week. After a promotional scheme the average sale increased to 21 cars per week. The percentage increased in the sale of cars was-
A. 39.33% B. 40% C. $42 \large\frac{6}{7} \%$ D. 140% Answer: Option BShow Answer
Solution(By Apex Team)
Number of cars sold per week originally = 15 × 7 = 105
Number of cars sold per week under scheme = 21 × 7 = 147
Increase in sale = 147 – 105 = 42
∴ Percentage increase
$\begin{array}{l}
=\left(\large\frac{42}{105} \times 100\right) \% \\
=\left(\Large\frac{4200}{105}\right) \% \\
=40 \%
\end{array}$
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