Working as an insurance salesperson, Andrew earns a base salary plus a commission on each new policy. Therefore, Andrew's weekly income, I, depends on the number of new policies, n, he sells during the week. Last week he sold 3 new policies and earned $760 for the week. The week before, he sold 5 new policies and earned $920. a) Find an equation for In). b) Interpret the meaning of the components of the equation