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?

Rationale

The store sold 132 copies of the CD in March.

In January, the store sold 100 copies. With a 10% increase in February, sales reached 110 copies, and a 20% increase in March resulted in 132 copies sold.

A (120) YOUR ANSWER

This choice represents an incorrect calculation for March. If the store had increased sales by 10% in February, it would not have corresponded to only selling 120 copies in March, as this does not account for the additional 20% increase on the February sales.

B (122) YOUR ANSWER

This option underestimates the sales for March. After selling 110 copies in February, a 20% increase would yield a sale of 132 copies, making 122 an inaccurate figure.

C (130) YOUR ANSWER

While this choice is a close approximation, it still does not reflect the correct calculations. A 20% increase on the February sales of 110 copies actually equates to an additional 22 copies, leading to 132 copies sold, not 130.

D (132) CORRECT

This choice correctly reflects the calculated sales for March. Starting from 110 copies sold in February, a 20% increase results in 22 additional copies, totaling 132 sold in March.

Conclusion

The calculations for the sales of the CD demonstrate a clear progression from January to March. Starting with 100 copies, the increase to 110 in February, followed by a 20% rise to 132 in March, illustrates the importance of applying percentage increases accurately. The correct answer confirms the sales figure for March as 132 copies.

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?

The store sold 132 copies of the CD in March.

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