If i have a pay rate of $21.00 and marked up 78.7% and made a 10% profit. how did i get $41.28?

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

So, our pay rate becomes

Now, he made a 10% profit,

So, pay rate becomes

which approximately $41.28