Determine the amount of taxable income that should be reported by a cash-basis taxpayer in 2020 in each of the following independent cases:

1. A taxpayer completes $525 of accounting services in December 2020 for a client who pays for the accounting work in January 2021.
2. A taxpayer is in the business of renting computers on a short-term basis. On December 1, 2020, she rents a computer for a $190 rental fee and receives a $475 deposit. The customer returns the computer and is refunded the deposit on December 20, 2020.
3. Same facts as (b) except that the computer is returned on January 5, 2021.
4. On December 18, 2020, a landlord rents an apartment for $520 per month and collects the first and last months' rent up front. It is customary that tenants apply the security deposit to their last month's rent upon moving out.
5. An accountant agrees to perform $360 of tax services for an auto mechanic who has agreed to perform repairs on the car of the accountants wife. The mechanic repairs the car in December 2020 and the accountant starts and completes the tax work in March 2021.