算cash flow:
-46 (买鱼)+ 100 (邻居给的钱)- 30 (找给坏蛋的钱)-100 (还给邻居的钱)=-76
换一种算法, 算beginning/ending equity balance:
Beginning:
inventory(fish):46
bop equity balance: 46
ending:
Inventory: 0
cash: 70
debt: (100)
eop equity balance: -30.
所以,这个net income 是-76。