Can you explain and give formula to why c) is the correct answer?

Write down: - security cash flow which has nominal yield 15%, - term 3 years, - rate of issue 80% and - the par value 10,000 USD They pay the interest every year and the capital at the end of the term in one amount. a) + 8,000; +1,500; +1,500; +11,500 b) - 8,000,0; 0; 10,000 c) - 8,000; +1,500; +1,500; +11,500 d) +8,000; - 1,500; - 1,500; - 11,500