How to calculate the first and last weight in express delivery?

The first weight is generally one kilogram, and the weight exceeding one kilogram is the continuous weight. \x0d\ For example, you can see it at a glance: \x0d\ If your express delivery is 4.6kg, the first weight divided by 1kg is 3.6kg, and your express delivery weight structure is: first weight 1k g+ continuous weight 4kg \x0d\ The first weight charge and the continuous weight charge are different (local) For example, the first weight 10 yuan/kg, the second weight 6 yuan/kg. Then the cost of that express delivery just now is: the first weight 1kg× 10+ the second weight 4 kg× 6 = 34 yuan.