Answer:
180
Step-by-step explanation:
I'll just manually compute this one. Every attempt she will add 2 more jumps.
Attempt Jumps Accumulated Jumps
1 6 6
2 8 14
3 10 24
4 12 36
5 14 50
6 16 66
7 18 84
8 20 104
9 22 126
10 24 150
11 26 176
12 28 204
Total jumps from 4th trip through 12th trip: 204 - 24 = 180 jumps