Calculation of Commission earned:
We are given that Joan sells new cars at a local dealership and she receives a 15% commission on profit.
So we can say that :
Commission earned = 15% * Total profit
Last week she sold 9 cars for the total of $10,870 dealer profit
Hence Commission earned shall be calculated as follows:
Commission earned = 15% * Total profit
Commission earned = 15% * 10870 = $1,630.50
Hence, the Commission earned by Joan is <u>$1,630.50</u>