As per given by the question,
There are given that,
The cost of 15 shirts is $60.
Now,
The cost of 15 shirts is $60,
Then,
The cost of the 1 shirts is;
[tex]\frac{60}{15}=4[/tex]So,
The cost of the 8 shirts is,
[tex]8\times4=32[/tex]Hence, the cost of the 8 shirts is $32.