Subject: General Aptitude · Chapter: Average · Exam: 2010 · Marks: · Difficulty:
The average sale of a car dealership was 15 cars per week. After a promotional scheme the average sale increased to 21 cars per week. The percentage increase in the sale of cars was
(a)39.33\%
(b)40\%
(c)$42 \frac{6}{7} \%$
(d)140\%
Answer
Answer (as printed): B
Explanation
Number of cars sold per week originally = 15 × $7=105$. Number of cars sold per week under scheme $=21 \times 7=147$. Increase in sale $=147-105=42$. $$\text { ∴ Percentage increase }=\left(\frac{42}{105} \times 100\right) \%=40 \% \text {. }$$
Explanation as extracted from the printed page; notation may be imperfect.