30 ! calculate the percent increase or decrease between the starting and ending quantities below. round your answer to one decimal place.

1) start: 3 end: 10

2) start: 9 end: 20

3) start: 100 end: 85

Robin spent 25% more time on his research project than he had planned he’s been an extra h ours on the project which of the following expressions could represent the number of hours rob actually spent on the project