A sales associate in a department store earns a commission on each

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A sales associate in a department store earns a commission on each suit and each pair of shoes sold. One week she earned $47 in commission for selling 3 suits and a pair of shoes. The next week, she earned $107 in commission for selling 7 suits and 2 pairs of shoes. How much commission does she earn for selling each suit and each pair of shoes? Solve by substitution.