4. Al is an attorney who operates his law practice as a sole proprietor. During 2020, he received cash of $150,000 for legal services. Of the amount collected, $25,000 was for services rendered back in 2019. At the end of 2020, Al had outstanding accounts receivable of $40,000, all for services rendered in 2020. Included in the accounts receivable was $10,000 that was charged to a client who died in early 2021. During 2021, Al has now learned he has no hope of collecting the balance due from the clients estate. Compute Als Gross Income for 2020:

a. Using cash basis

b. Using accrual basis