Please help me to solve the 3rd question. The option DM is best when the contracted volume is over how many units?

Meile Machine Shop, Inc., has a 1-year contract for the production of 250,000 gear housings for a new off-road vehicle. Owner Laura Meile hopes the contract will be extended and the volume increased next year. Meile has developed costs for three alternatives. They are: general-purpose equipment (GPE), flexible manufacturing system (FMS), and expensive but efficient dedicated machine (DM). The cost data follow: AAF The option GPE is best when the contracted volume is below units. (Enter your response as a whole number.) The option FMS is best when the contracted volume is between and units. (Enter your responses as whole numbers.) The option DM is best when the contracted volume is over units. (Enter your response as a whole number.)