Question

One minute after it is released, a hot-air balloon rises 100 feet. In each succeeding minute, the balloon rises only 50% as far as it rose in the previous minute. How far will the balloon rise in the five minute?

Answer 1

1min: 100 ft

2min: 100(.5)= 50 ---> 100+50= 150 ft

3min: 50(.5)=25 ---> 150+25= 175 ft

4min: 25(.5)=12.5 ---> 175+12.5= 187.5 ft

5min: 12.5(.5)=6.25 ---> 187.5+6.25= 193.75ft

answer: 193.75 ft