2. A record store sold 100 copies of a CD in January. In February, the store's sales of the CD increased by 10 percent over the January sales. In March, the store sold 20 percent more copies of the CD than it sold in February. How many copies of the CD did the store sell in March?
Answer: D
The store sold 132 copies of the CD in March.
To determine the number of CD copies sold in March, we start with the January sales of 100 copies. February sales increased by 10 percent, resulting in 110 copies sold. In March, sales rose by 20 percent over February, leading to a total of 132 copies sold.
A) 120
Option A is incorrect because it does not reflect the correct percentage increase calculated for February or March. If the sales had only increased by 10 percent in February and remained the same in March, the total would have been 120, but the March figures are based on a further increase.
B) 122
Option B is incorrect as it miscalculates the sales figures. Even though it represents a slight increase from January, it does not account for the 20 percent increase in March, which should result in a much higher total.
C) 130
Option C is not the correct answer because it underestimates the sales in March. The correct calculation shows a higher increase than what is represented here, failing to incorporate both the February and March sales correctly.
D) 132
Option D is correct. The calculation starts with 100 copies in January, increasing to 110 in February after a 10 percent increase. Then, with a 20 percent increase in March, the total becomes 132 copies sold, accurately reflecting the sales growth.
Conclusion
The sales calculation for March demonstrates that the correct answer is 132 copies, as it precisely follows the series of percentage increases from January to February and finally to March. Other options fail to account for the compounded increases, making them incorrect.