Tall man. The calculation method of canteen deduction can be divided into fixed deduction and floating deduction. The fixed deduction point is a certain deduction point specified in the contract, 5% or 10, which is deducted from the turnover every month. The floating deduction point is determined according to the turnover of the canteen, which is between 5% and 20% of the turnover, while the deduction point of the factory canteen is 26%, so it is considered high.