Please show me how to calculate, thanks!

Chandler Sporting Goods produces baseball and football equipment and lines of clothing. This year the company had cash and marketable securities worth $310,734, accounts payables worth $1,188,650, inventory of $1,730,494, accounts receivables of $1,601,950, short-term notes payable worth $473,389, and other current assets of $229,382. What is the company's net working capital? Round your answer to the nearest two decimals if needed. Do not type the $ symbol. Tim Dodson has borrowed $169,299 to pay for his new car. The annual interest rate on the loan is 15 percent, and the loan needs to be repaid in 21 payments. What will be his annual payment if he is planning to make his first payment today? Round to the nearest two decimals if needed. Do not type the $ symbol Cassandra Dawson wants to save for a trip to Australia. She will need $19,258 at the end of 14 years. She can invest a certain amount at the beginning of each of the next 14 years in a bank account that will pay her 6 percent annually. How much will she have to invest . annually to reach her target? (Round to the nearest two decimals. Do not type the $ symbol)