Solve.Regrind, Inc. regrinds used typewriter platens. The variable cost per platen is $1.70. The total cost to regrind 90 platens is $500. Find the linear cost function to regrind platens. If reground platens sell for $9.50 each, how many must be reground and sold to break even?
A. C(x) = 1.70x + 500; 65 platens
B. C(x) = 1.70x + 347; 45 platens
C. C(x) = 1.70x + 500; 45 platens
D. C(x) = 1.70x + 347; 31 platens
Answer: B
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