#rate values result
0.10, -10000, 3000, 4200, 6800, 1188.4434123352
0.08, 8000, 9200, 10000, 12000, 14500, 41922.061554932
0.08, 8000, 9200, 10000, 12000, 14500, -9000, 36250.534912984
0.05, 2000, 2400, 2900, 3500, 4100, 12678.677633095