Problem 6-7 Johnson Industries received a contract to develop and produce four high-intensity long-distance receiverftransmitters for cellular telephones. The first took 2,400 labor hours and $42,000 worth of purchased and manufactured parts; the second took 1,700 labor hours and $34,020 in parts; the third took 1,440 labor hours and $30,450 in parts; and the fourth took 1,173 labor hours and $26,880 in parts. Johnson was asked to bid on a follow-on contract for another dozen receiverftransmitter units. (Hint: There are two learning curvesone for labor and one for parts.) Use Exhibit 6.5. a. How many labor hours should Johnson estimate are needed for the additional 12 units? (Round your answer to the nearest whole number.) -m b. How much should Johnson estimate the parts cost will be for the additional 12 units? (Round your answer to the nearest dollar amount.) $ 471,461