The amount of money an employee earns monthly before taxes, in dollars, after selling n products is $1,300 + $300n. which statement is correct? a. for every product sold, the employee's earnings increase by $1,300. b. for every product sold, the employee's earnings increase by $1,000. c. for every product sold, the employee's earnings increase by $1,600. d. for every product sold, the employee's earnings increase by $300.