Digicomp produces a new telephone system with built-in TV screens. Its learning-curve rate is 80%.

a) If the first one took 56 hours, how long will it take Digicomp to make the eleventh system?

b) How long will the first 11 systems take in total?

c) As a purchasing agent, you expect to buy units 12 through 15 of the new phone system. What would be your expected cost for the units if Digicomp charges $30 for each labor-hour?