Final answer:
The percentage of Roxy's disability benefits that is taxable depends on how the premiums for disability insurance are paid.
Step-by-step explanation:
If Roxy is disabled, the percentage of her benefits that will be taxable will depend on how the premiums for disability insurance are paid. In this case, Roxy pays 40% of the premium with after-tax dollars, which means she has already paid taxes on that portion. The remaining 60% of the premium is paid by Blizzard Coolers Inc, but it is not explicitly mentioned whether it is paid with pre-tax or after-tax dollars.
If the remaining 60% of the premium is paid with pre-tax dollars, then the benefits Roxy receives will be fully taxable. This means that 100% of her benefits will be subject to taxes. On the other hand, if the remaining 60% of the premium is paid with after-tax dollars, then Roxy's benefits will not be taxable. In this case, the correct answer would be option a. 0%.
Without additional information regarding how the 60% premium is paid, it is not possible to determine the exact percentage of Roxy's benefits that is taxable.