First walk=descend of 1024 feet in 17 minutes
second walk=descend of 500 feet in 7 minutes
so in total she descended 1024+500=1524 feet in 7+17=24 minutes
as an average rate this equals 1524/24=63.5 feet/minute descended
or an average rate of -63.5 feet/minute in altitude (note the minus)
Answer:
there should be no greather less than sign
Explanation is in a file

2015-2000=15 years
P=100,350,000×(1+0.017)^(15)
P=129,220,575.43