x = amount of sales per week

C1 = .06 x 
C2 = 250 + .03x 
C1 = C2 
.06 x = 250 + .03 x 
.03x = 250 
x = $8333.333.... 
Conclusion, x = $8334 
.06(8334) = 500.04   and 250 + .03(8334) = 500.02  Thus you would make 2 cents more from company C1 if you only sell the minimum. 
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