A new housekeeper at the Grand Hotel, James, is responsible for cleaning 30 rooms on the third floor. Housekeepers at the grand typically improve on an 80% learning curve. On his fits day, James has completed the first 5 rooms in 2.5 Hours

a.) How long did it take james to clean the first room

b.)How long to clean all 30 rooms on the first day

c.) Based on his time for the first five rooms, estimate average time it should take an expert to clean 30 rooms

I need typed answer