How do you get the minus (negative) 50% purchases of materials for DEC and JAN?

On January 1, Easton Company had cash on hand of $90,000.All of January's $236,000 sales were on account. December sales of $202,000 were also all on account.Experience has shown that Easton typically collects 40% of receivables in the month of the sale and the balance the following month.All materials and supplies are purchased on account and Easton has a history of paying for half of these purchases in the month of purchase and half the following month.Such purchases were $153,000 for December and $172,000 for January.All other expenses including wages are paid in the month incurred.These amounted to $42,000 in December and $60,000 in January.Use this information to determine the projected ending balance of cash on hand for January. (Round answer to the nearest whole dollar)