The number of copies sold to date will be 524,324.
The quantity of anything is stated as though it were a fraction of a hundred.
A book sold 38,800 copies in its first month of release.
Suppose this represents 7.4% of the number of copies sold to date.
Let n be the number of copies sold to date.
Then the number of copies sold to date will be
7.4% = 38800 / n x 100
0.074 = 38800 / n
n = 38800 / 0.074
n = 524,324.32
n ≅ 524,324
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