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The cost of buying \(x\) units of a certain product is given by the expression \(C(x)=a+(x+h)b,\) where \(a, b\) and \(h\) are constant positive parameters. What is the positive difference, in dollars, between the cost of buying \(50\) units and the cost of buying \(25?\)
1. \(h=50\)
2. \(b=60\)
OA B
1. \(h=50\)
2. \(b=60\)
OA B
