Problem 4-31 (Algorithmic) (LO. 2, 5) Al is a medical doctor who conducts his practice as a sole proprietor. During 2022, he received cash of $307,600 for medical services. Of the amount collected, $39,600 was for services provided in 2021. At the end of 2022, Al had accounts receivable of $89,700, all for services rendered in 2022. In addition, at the end of the year, Al received $12,000 as an advance payment from a health maintenance organization (HMO) for services to be rendered in 2023. a. Compute Al's gross income for 2022 using the cash basis of accounting. Feedback Check My Work