During the second quarter of 1984, a total of 2,976,000 domestic cars were sold. If this was 24 percent greater than the number sold during the first quarter of 1984, how many were sold during the first quarter?

My effort is shown below.

Let c = number of cars sold during the first quarter in 1984

0.24c = 2,976,000

Solving for c, I got 12,400,000 cars.

I then subtracted 2,976,000 from c.

My answer is 9,424,000 cars sold during the first quarter in 1984. The book's answer is 2,400,000 cars.