Aphotographer uses an online service to sell some of his work. the amount of money he will make from selling 10 copies of the same photograph is given by the expression below, where p represents the price determined for each copy:

10(0.75p - 0.5)

according to this expression, which of the following most likely describes the agreement between the online service company and the photographer?
a. the company keeps 25% of the amount paid for each copy and charges the photographer $0.50 for every copy purchased.
b. the company keeps 25% of the amount paid for each copy and charges the photographer $0.50 for every 10 copies purchased.
c. the company keeps 75% of the amount paid for each copy and charges the photographer $0.50 for every copy purchased.
d. the company keeps 75% of the amount paid for each copy and charges the photographer $0.50 for every 10 copies purchased.