Could you please explain how to breakdown and solve these questions? Thank yoh so much!

15. If a company had an EBITDA of 6% of sales of $100,000,000 and a valuation multiple of 5x, what would be the growth in the value of the company if it grew sales to $120,000,000, EBITDA to 7%, and multiple to 7x. a. $3,600,000 b. $20,400,000 c. $28,800,000 d. $30,000,000 e. $67,200,000 1. What is the NPV of the following cash flows with a 12% required rate of return? Year 0:CF = -80,000 Year 1:CF = 20,000; Year 2:CF = 40,000; Year 3:CF = 60,000; 4. Use the following table to determine the fixed cost and the variable cost. Month Jan Mar Apr May Hours of Maintenance 625 700 550 775 Total Maintenance Cost 8125 8500 7750 8875