post the solution
C1 =x
C2 = 105-x
S1 = x - 20% of x
= x - x/5 = 4x/5
S2 = 105-x + 20 % of (105-x)
= 105- x+ 20*103 - x/5
=120000 - 6x/5
4x/5 = 120000 - 6x/5
x = 60000
C1 = 60000
C2 = 40000
C1-C2 = 20000
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