Please answer the following question by reasoning step-by-step.
Krishna and Callum are playing a game where they earn 10 points if they win any round. If they played eight matches and Krishna won 3/4 of the matches, what is the total number of points that Callum earned?

20
Krishna won 3 / 4 * 8 rounds = 6 rounds.

If they played eight rounds, Callum won 8 rounds - 6 rounds = 2 rounds.

If a round earns one 10 points, Callum got 2 rounds * 10 points / round = 20 points.

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Thus, the answer is 20