Identify the percent of change is an increase or decrease. then find the percent of change. round to the nearest tenth of the percent as necessary.

75 people to 25 people

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)