Marcus, a cash-basis sole proprietor, had the following receipts and disbursements for 2020: Gross receipts $60,000, Cost of sales $30,000, Other operating expenses $6,000 and personal expenses $600. For 2020, what amount should Marcus report as net earnings from self-employment?

Select one:

a. $23,400

b. $24,000

c. $30,000

d. $24,600

e. None of the above