May June July Sales (units) 200 250 350 Selling price $10 Expenses $2,000 $2,500 $3,200 Opening cash $2,000 Balance Cash from sales is collected one month in arrears At the start of may $1,000 was owed by customers from the previous month The experses include depreciation of $500 a month Expenses are paid during the month they are incurred a) From the data above, calculate the closing cash balance for the months of May, June and July, please show all your workings (4 points)