because

5 tons per shipment

The more times of transportation, the more tons of goods.

contrary/opposite

The more tons of goods, the more times they need to be transported.

therefore

Proportional

2

because

A pen and a 8 yuan.

The more you buy, the more money you have to pay.

contrary/opposite

The more money you pay, the more pens you can buy.

therefore

Proportional

What early knowledge. Don't know right