Given data:
The number of copies sold in first month are n=32,700.
Suppose the total number of copies are x.
[tex]\begin{gathered} x\times\frac{7.4}{100}=n \\ x\times\frac{7.4}{100}=32,700 \\ x=441,891.89 \\ \approx441,892 \end{gathered}[/tex]Thus, the total numbers of copies sold are 441,892.