Profit rate of main business = (main business income-main business cost-main business tax and surcharge)/main business income * 100%

There is a discount on this issue, so the income from the main business is reduced accordingly.

Profit from main business is 2012 = (5930-3028-365)/5930 = 42.78%.

Profit from main business is 2013 = (7495-3710-562)/7495 = 43%.

Profit from main business is 2014 = (8520-4190.4-676)/8520 = 42.88%.

Hope to adopt, thank you!