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Given 20 and 50%, multiply 20 by 0.5, which equals 10.

Given 70 and 30%, multiply 70 by 0.3, which equals 21.

Or if you prefer, given 20 and 50%, multiply 2 by 5, which equals 10.

Or if you prefer, given 70 and 30%, multiply 7 by 3, which equals 21.

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