We know that 9.1% of the total copies sold are 37,900.
If we call N to the total amount of copies sold and see that 9,1% correspond to a proportion of 9.1/100=0.091, we can calculate N as:
[tex]\begin{gathered} 0.091\cdot N=37,900 \\ N=\frac{37,900}{0.091} \\ N\approx416,484 \end{gathered}[/tex]Answer: the total number of copies sold is approximately 416,484.
