That cannot be answered without more detail. What kind of class are you talking about? Where do these instances occur? Generally speaking, you find out the number of something by counting it.
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To find 0.3 percent of a number, multiply that number by 0.003. In this instance, 0.003 x 100 = 0.3.
To find 10 percent of a number, multiply the number by 0.1. In this instance, 0.1 x 400000000 = 40000000.
To find 80 percent of a number, multiply the number by 0.8. In this instance, 350 x 0.8 = 280.
To find 20 percent of a number, multiply the number by 0.2. In this instance, 0.2 x 1670 = 334.
To find 30 percent of a number, multiply the number by 0.3. In this instance, 0.3 x 606 = 181.8.