I'm having trouble with those question

1 A firm has credit sales of 144,000 yearly with credit terms 30 days that is also the average collection period and no discount for early payment. Now it considers new trade terms of 2/10 net 30 days. What would be the incremental decrease in account receivables if the new trade terms are ac- cepted by all customers? 2 A firm has credit sales of 144,000 yearly with credit terms 30 days that is also the average collection period and no discount for early payment. Now it considers new trade terms of 2/10 net 30 days. What is the receivables turnover? 3 In 2016, CDE had annual revenue of $100 million. While variable costs accounted for 60% of its revenue, its fixed costs were $20 million. If CDE is expecting to increase its revenue by 5% in 2017, what will the percentage increase in its earnings before interest and tax (EBIT) be? 4 A company produced 20,000 tires this year and sold them at $60 each. The variable cost is 50% of sales and fixed cost is $400,000. The company pays 50,000 in interest and 34% in taxes. The degree of combined leverage is 5 ABC Corp., an all-equity financed firm, has decided in favour of a capital restructuring. It is planning to borrow $5 million at an interest rate of 8% to repurchase some of its shares. Cur- rently, it has 1,000,000 shares outstanding, traded at $40 per share on the market. What is ABC's leverage- indifference EPS if it has a tax rate of 30%