The loan company calculates the income according to the interest received, and calculates the cost according to the profit of expenditure and related expenses, and the profit is calculated according to the income-cost, which has nothing to do with the principal.
Idle funds mainly calculate the principal recovered and the profits generated.
According to what you listed in the above question
Income: (1400-1000)+(1560-1400) = 560 yuan.
Cost: 560 (the expenses you wrote above are not loans)
Profit: 560-560=0