The first 15-minute chain pull caused the balloon to rise 50*15=<<50*15=750>>750 feet.
Releasing the chain for 10 minutes caused the balloon to descend 10*10=<<10*10=100>>100 feet.
The second 15-minute chain pull caused the balloon to rise another 50*15=<<50*15=750>>750 feet.
Thus, at the end of the second chain pull, when the balloon was at its highest elevation, the balloon had risen to an elevation of 750-100+750=<<750-100+750=1400>>1400 feet above the earth's surface.
#### 1400