Johnson Industries received a contract to develop and produce four high-intensity long-distance recelveritransmitters for cellular telephones. The first took 2.000 labor hours and $39,000 worth of purchased and manufactured parts; the second took 1.720 labor hours and $37,440 in parts; the third took 1,580 labor hours and \$36,320 in parts; and the fourth took 1,445 labor hours and $35,190 in parts. Johnson was asked to bid on a follow-on contract for another dozen recelveritransmitter 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.) b. How much should Johnson estimate the parts cost will be for the additional 12 units? (Round your answer to the nearest dollar amount.)