Complete the following table, indicating the amount and direction of effect of each transaction on each item in Rockland Shoe Company's income statement. Be sure to compute the total effects in the final column. Rockland allows returns within only two weeks of the initial sale. (Enter any decreases to account balances with a minus sign.) July 12 Rockland sold merchandise to Kristina Zee at its factory store. Kristina paid for the $300 purchase in cash. The goods cost Rockland $160. July 15 Sold merchandise to Shoe Express at a selling price of $5,000, with terms n/30. Rockland's cost was $3,000. July 23 Shoe Express returned $1,000 of the shoes purchased July 15. The returned shoes were in perfect condition and had cost Rockland $600. July 31 Shoe Express paid the balance owing after the events on July 15 and 23.