Jack works at a sporting goods store and makes a commission of 20 percent. His sales for each week are shown below. How much did Jack make in total in commission during all four weeks?WeekSales1$3,0002$2,5003$3,5004$4,000

Add Jack’s sales for all four weeks: $3,000 + $2,500 + $3,500 + $4,000 = $13,000. His commission is 20% of $13,000, or 0.20 × $13,000 = $2,600. Jack made $2,600.00 in total commission.

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