How much is a catty? Answer this question according to the relevant formulas, rules and calculation methods of mathematical calculation. For example, I went to the supermarket to buy ten Jin of sugar, and a * * * cost 38 yuan. How much is the A Jin of sugar? The calculation formula is as follows. 38 yuan divided by 10 kg is equal to 3.8 yuan per kg.

For example, I bought five kilograms of pork and spent 100 yuan. The calculation formula of one kilogram of pork is as follows. Divided by five kilograms, 100 yuan is equal to 20 yuan per kilogram.