月份 现金 进账 出账 结余
1 20000 3000 5000 18000
2 15000 3000 5000 16000
3 10000 3000 5000 14000
4 5000 3000 5000 12000
5 0 3000 5000 10000
6 0 3000 5000 8000
7 0 3000 5000 6000
8 0 3000 5000 4000
9 0 3000 5000 2000
10 0 3000 5000 0
11 0 3000 5000 -2000
12 0 3000 5000 -4000
总结,要么你最后借几千先补上,要么每月再多存500