Answer: His Total salary this month = $2585
Step-by-step explanation:
Alex sold 7 cars/month, average price of each car = $4500
total car sales = $4500 x 7 = $31500 for the month
He earns a 9% commission on his monthly sales after the first $10,000.
So he earns 9% commission on $31500 - $10,000 = $21500
9% of $21500 = $1935
His base salary is $650.
His Total salary this month = base salary + 9% commission = $650 + $1935 = $2585