FBLA Business Calculations Practice Test 2026 – Complete Study Resource

To determine how much Mary will earn working for 40 hours, we first need to convert the hours into minutes since she packs one box per minute.

There are 60 minutes in an hour, so working for 40 hours amounts to:

40 hours × 60 minutes/hour = 2400 minutes.

Given that Mary earns 10 cents for each box she packs, we can calculate her total earnings by multiplying the number of boxes she packs (which is equal to the number of minutes she works, since she packs one box per minute) by her earnings per box:

2400 boxes × $0.10/box = $240.

Thus, Mary will make a total of $240 working 40 hours. This confirms that the correct answer reflects the accurate application of the calculations involved in determining her earnings based on her work rate and total working time.