as of january 1 of the current year, the gunner company had accounts receivables of $50,000. the sales for january, february, and march were as follows: $120,000, $140,000, and $150,000, respectively. of each month's sales, 20% are for cash. of the remaining 80% (the credit sales), 60% are collected in the month of sale, with the remaining 40% collected in the following month. what is the accounts receivable balance as of february?