China Naming Network - Weather knowledge - How to calculate the limited labor freight?

How to calculate the limited labor freight?

An algorithm for limiting manual handling of goods.

1, domestic mail, the first weight is 8 yuan RMB, and the freight will be increased by 4 yuan RMB for each additional kilogram.

2, international mail, the United States sent back to China, postal international express, 15 kg, freight 1500 RMB, per kg 100 RMB.