Each day Chris is chided for not cleaning up his room, so he picks up approximately percent of the items on the floor in the morning. (He always rounds off to the nearest whole number if his calculations result in fraction.) Each day, ten new items somehow end up on the floor. If he has a clean floor on Sunday morning, how many items will be on the floor on Saturday night?
Source: NCTM Mathematics Teacher, October 2006
Sunday morning starts with a clean floor but in the night items appear.
Monday he cleans up but ends up with .