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Verified answer
C = 400 + 0,2YY = 600
C = 400 + 0,2Y
= 400 + 0,2(600)
= 400 + 120
= 520
Y = C + S
600 = 520 + S
600 - 520 = S
80 = S
600 = 400+0,2(600) + s
600 = 400+120 + s
600 = 520 + s
S = 600- 520
S = 80