Answer: Procedure are given below :
Step-by-step explanation:
Since we have given that
Pay rate = $21.00
if he marked up by 78.7% , then
[tex]78.7\%\text{ of }21\\\\=\frac{78.7}{100}\times 21\\\\=16.527[/tex]
So, our pay rate becomes
[tex]\$21+\$16.527=\$37.527[/tex]
Now, he made a 10% profit,
[tex]10\%\text{ of }37.527\\\\=\frac{10}{100}\times 37.527\\\\=\$3.7527[/tex]
So, pay rate becomes
[tex]\$37.527+\$3.7527\\\\=\$41.2797[/tex]
which approximately $41.28