Academic Dishonesty Investigations Ltd. operates a plagiarism detection service for universities and colleges. Required: 1. Prepare journal entries for each transaction below. (If no entry is required for a transaction/event, select "No journal entry required" in the first account field.) a. On March 31, ten customers were billed for detection services totalling $44,500. b. On October 31, a customer balance of $2,670 from a prior year was determined to be uncollectable and was written off. c. On December 15, a customer paid an old balance of $1,875, which had been written off in a prior year. d. On December 31, $1,215 of bad debts were estimated and recorded for the year. 2. Complete the following table, indicating the amount. Ignore income taxes. (Enter any decreases with a minus sign.) Transaction Net Receivables Net Sales Income from Operations