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? a. 40,000 times more likely b. 4,000 times more likely c. 400 times more likely d. 40 times more likely

Manually filed returns contain errors = 20% of it.

Electronically filed returns contain errors = 0.05% of it.

Now to find how much more likely is a manual filer make an error than an electronic filer we will have to find the ratio of it.

We will get it by dividing the percentage of manually filer by the percentage of electronically filer.

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So we can say a manual filer is 400 times more likely to make an error than an electronic filer.

So the correct option is option C.

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