Tax returns filed manually have a 20% chance of containing errors, while tax returns filed electronically have a 0.05% chance of containing the same. If 2.7 million tax returns are filed each way, how many more erroneous manually filed returns will there be than erroneous electronically filed returns?

Given:

errors on tax returns filed manually 20%

errors on tax returns filed electronically 0.05%

2.7 million tax returns

manual filing:

2,700,000 x 20% = 540,000

electronic filing

2,700,000 x 0.05% = 1,350

540,000 - 1,350 = 538,650

There would be 538,650 more erroneous tax returns filed manually than there are filed electronically.