A man decided to paint his house himself after office hours. He can paint 25sq.m per hr on the average. It takes him 15mins to prepare his materials after painting. If there are 900sq.m to be painted, how long it will take him it paint his house if he devotes 2.5hrs each day. Select one: O a. 19.5 days О b. 18.5 days О c. 18.75 days о d. 19.75 days