Column type:

Days required = (15-4.17) ÷ (4.17-3.17)+1=1.

1 1.83 This day should be counted as 12.

The highest height reached during the day, the height at the end of the day.

During the day 1 4. 17m 1m (it drops by 3. 17m at night)

The next day: 5.17m 2m (it drops by 3.17m at night)

Day 3 6.17m 3m

......

Day 10/3.17m10m

Day 1 114.17m1m

Arrival 12 days 15. 17 meters!