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A.
√(k-2)
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B.
√(k+2)
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C.
(k-2)
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D.
(k+2)
Correct Answer:
A. √(k-2)
Explanation:
To solve the problem, start with the given equation: 20% of a = b, which can be written as 0.2a = b. The question asks for the value of b% of 20, which is expressed as (b/100) * 20. By substituting the expression for b into this second equation, you get (0.2a / 100) * 20. Multiplying 0.2a by 20 results in 4a, so the expression becomes 4a / 100. This is equivalent to 4% of a. Therefore, b% of 20 is the same as 4% of a.
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