Adam elects the accrual method of accounting for his business. What amount of deductions does Adam recognize in year 0 for the following transactions?

a. Adam guarantees that he will refund the cost of any goods sold to a client if the goods fail within a year of delivery. In December of year 0, Adam
agreed to refund $2,400 to clients, and he expects to make payment in January of year 1.

b. On December 1 of year 0, Adam paid $480 for a one-year contract with CleanUP Services to clean his store. The agreement calls for services to be
provided on a weekly basis.

c. Adam was billed $240 for annual personal property taxes on his delivery van. Because this was the first time Adam was billed for these taxes, he did not
make payment until January. However, he considers the amounts immaterial.