Silifone Manufacturing Company has the following sales budget: Month (in 000) 500 400 550 January February March April May June 450 500 470 The cash collection schedule of sales has been as follows: 70% of sales collected in month of sale 20% of sales collected in month following sale 5% of sales collected in second month following sale 5% of sales is uncollectible What is the ending balance of accounts receivable for May, assuming the uncollectible balance is written off after the second month