8. 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.
The store's sales in March amounted to 132 copies after experiencing a 10 percent increase in February and a subsequent 20 percent increase in March.
A) 120
Option A is incorrect because it does not account for the 10 percent increase in sales from January to February. Selling 120 copies would imply that there was no increase in sales, which contradicts the information provided.
B) 122
Option B is also incorrect. This figure does not reflect the 20 percent increase over the sales in February. Calculating a 10 percent increase on 100 brings the February total to 110, and a 20 percent increase on that would yield 132, not 122.
C) 130
Option C is incorrect as well. While it is higher than the previous options, it still fails to properly calculate the sales from February to March. The correct calculation shows a total of 132 copies sold in March after the proper percentage increases are applied.
D) 132
Option D is correct. The store sold 100 copies in January, which increased to 110 in February due to the 10 percent increase. In March, the 20 percent increase on the February total of 110 results in 132 copies sold, accurately reflecting the problem's conditions.
Conclusion
The correct answer is 132, as it accurately follows the sales progression from January through March, incorporating the specified percentage increases. All other options fail to reflect the accurate calculations based on the sales data provided. Thus, Option D is the only choice that aligns with the information given in the problem.