The program divides lines 6 by line 5c (then multiplies the result by line 10b divided by 12 months, if line 10b has an entry). In the case of the example you provided, the calculation is (48/3000) * (3/12) = 0.40%.
If you had used the vehicle for 12 months, the percentage would have been 1.6%
Any time you question how a number is calculated, right-click on the box and choose "About" to see the On-Demand Tax Help for more information.
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