I. 5 yuan is accepted within 1000g.

And for every 500g that exceeds 1000 and is less than 5000, the 2 yuan will be increased on the original basis, that is, 4000 yuan will be charged according to the price of every 500g 2 yuan, that is, 16 yuan.

Finally, if it exceeds 5000 grams, that is, 6520-5000= 1520, the part less than 500 grams will be charged as 500 grams, that is, 4 yuan.

The total * * * is 5+ 16+4=25 yuan.

Extended data:

Calculation of parcel fee for express and surface mail: actual fee = parcel fee +3 yuan registration fee +0.5 yuan document fee+insured fee (voluntary). When ordering, the system displays the cost as the actual cost. The first weight of the package is 500g, and the second weight is 500g. Less than 500g, according to 500 g calculation.

EMS domestic express tariff calculation: 20 yuan within 500g. Mail weighing more than 500 grams is charged by region. The provinces (autonomous regions and municipalities) where the destination is located will be divided into three charging areas with reference to the transportation distance between provincial capitals. 1 zone (1500km and below) charges 6 yuan for every 500g continuous weight; Area 2 (1500 km to 2,500 km) 9 yuan; Area 3 (more than 2,500km) 15 yuan.