The First Unit of a Product Took 80 Work Days

Multiple Choice

The first unit of a product took 80 work days.The learning curve is estimated to be 90%.The time for the fourth unit will be about ________ work days and the time for the first four units will be about ________ work days.(Use Table E.3)

A) 51;250
B) 250;51
C) 65;285
D) 51;cannot be determined
E) 65;cannot be determined