Regrind, Inc $C(x)=1.70 x+215$ Break-Even $=221$ B) $C(x)=1.70 x+215$

Regrind, Inc. regrinds used typewriter platens. The cost per platen is $1.70. The cost to regrind 50 platens is $300. Find the linear cost function to regrind platens. If reground platens sell for $9.20
Each, how many must be reground and sold to break even?

A) $C(x) =1.70 x+215$
break-even $=221$
B) $C(x) =1.70 x+215$
break-even $=29$
C) $C(x) =1.70 x+300$
break-even $=41$
D) $C(x) =1.70 x+300$
break-even $=29$