Suppose in the sample problem in Section 29.14 that modular fixturing is used, which reduces the toolmaker's labor to 4 hours and the design cost to $100 (4 hours at $25 per hour), that the material cost (modular elements) for the subplate structural elements, clamps, and so on, was $600. What is the break-even quantity for a modular fixture? (Note: The modular fixture is used for the job, then disassembled and returned to the tool room. The parts are reused in other workholders.)