Exercise 4 Use the table provided in the Excel sheet identified as "Exercise 2, 3 and 4" to analyze and indicate the effect of the following transactions on the accounting equation. Contabilidad Express is an accounting company operated by Orlando Rojas. At the end of April, the following transactions were recorded: Advertising expenses of $ 2,000 were paid. A purchase of office supplies was made on credit for $ 400. Services rendered to customers on credit were billed for $ 6,000. A payment was received for a service rendered on the spot for $ 1,800. A payment for services rendered on credit was received for $ 2,500.