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Answer:
50C + 30D = 550 -------(1)
44C + 36D = 532 -------(2)
(2) - (1)
6C - 6D = 18
Divide both Sides by 6
C - D = 3
C = (3 +D) ----------(3)
Substitute 3 in 1
50(3 +D) + 30D = 550
150 + 50D + 30D = 550
80D = 550 -150
80D = 400
D = 400÷80
D = 5
C = (3+ D) ----------(3)
C = 3+5
C = 8
Chicken costs $8.
Duck costs $5.