Page 77: For example, on the label of clothes and trousers, and on the nutrient list behind drinks, it should be used for quality inspection.

Page 78: Do the first question: 1% 28% 0.5%

Question 2: 17%, 45%, 99%, 100% and 140%.

0.6%, 7.5%, 33.300%, 12 1.700% and 300%.

The third question: the fraction represents the ratio between two quantities, and it can also represent a specific quantity.

Percent only indicates the ratio between two quantities, and there is no unit name behind it.

These are all what our teacher said. It's simple. It's the one on page 76. Our teacher didn't say anything about them. Please forgive me! ! !