hello
to solve this question, we simply need to subtract 8.9% from 100 and then find the value
or we can still use this value but instead find the ratio between the first month and the total sales
we find 8.9 % from the total sale which is 37800 copies
[tex]\begin{gathered} \frac{8.9}{100}=\frac{37800}{x} \\ \text{cross multiply both sides and solve for x} \\ 8.9\times x=100\times37800 \\ 8.9x=3780000 \\ \text{divide both sides by the coeffiecient of x which is 8.9} \\ \frac{8.9x}{8.9}=\frac{3780000}{8.9} \\ x=424,719.101\approx424,719 \end{gathered}[/tex]from the calculations above the total sales is equal to 424,719 copies
