He will earn the following amount:
So, he will earn a commission of approximately $0.67.
***Explanation***
*Since we are given that he will earn the 4.25% commission for each sale and he sold $15.725 we will operate as follows:
*The $15.725 will represent 100% of the price of the sale, and we will want to find what is 4.25% of that:
*We then multiply the total cost of the sale ($15.725) times the percentage we want to obtain (4-25%) and divide that by the percentage that the whole sale represents (100%), that is:
So, we round to the nearest cent:
So, the commission that he will earn for the $15.725 sale is approximately $0.67.