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 10 percent of a number, multiply the number by 0.1. In this instance, 0.1 x 400000000 = 40000000.
To find 85 percent of a number, multiply the number by 0.85. In this instance, 260 x 0.85 = 221.
To find 65 percent of a number, multiply the number by 0.65. In this instance, 380 x 0.65 = 247.
To find six percent of a number, multiply the number by 0.06. In this instance, 800 x 0.06 = 48.
To find 0.3 percent of a number, multiply that number by 0.003. In this instance, 0.003 x 100 = 0.3.