in step $2$ of the answer, how to find $900$ Accounts Payable Increase in year $1$

(Calculating changes in net operating working capital) Faraway Fabricators, Inc., is considering the expansion of its welding and stamping division and estimates that this will require the firm's accounts receivable to increase by 12 percent of the added sales. Moreover, Faraway estimates that inventories will be 15 percent of the added cost of goods sold, while accounts payable will be 10 percent of that added cost. The firm's CFO estimates that its sales and cost of goods sold over the five-year estimated life of the investment are as follows: 2 3 4 5 Sales $150,000 $162,000 S174,960 $188,957 $204,073 $220,399 Costofgoodssold 90,000 97,200 104,976 113,374 122,444 132,240 a. What are the (operating) working-capital requirements of the project for Years 1 through 5? (Hint: You can assume that the expenditure for operating net working capital for Year 1 is made in Year O and so forth.) b. How much additional money must Faraway invest annually because of its working-capital requirements?