If 20% of all manually filed returns contain errors, and 0.05% of all electronically filed returns contain errors, how much more likely is a manual filer to make an error than an electronic filer?

Compare the two error rates by dividing 20% by 0.05%. Since 20 ÷ 0.05 = 400, a manual filer is 400 times more likely to make an error. The correct choice is “400 times more likely.”

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