How did the answer become 181.20?

Great Munchies (GM) Corporation has a variable operating cost ratio of 60 percent, its cost of capital is 12 percent, and current sales are P 100,000. All of its sales are on credit, and it currently sells on terms of net 30. Its accounts receivable balance is P 20,000. GM is considering a new credit policy with terms net 45. Under the new policy, sales will increase to P 120,000, and accounts receivable will rise to P 30,000.