4. Real-world examples please show your work! a. Suppose Daryl spontaneously decides to treat all his friends to pizza, drinks, and dessert at a dine-in Italian place. He has already spent his excess cash from his paycheck so he decides to put it on his credit card and pay for it later. The total cost for the pizza for his group of friends including the tip is $149.45. His credit card has an interest rate of 21.99%. If he makes payments of $25 per month, how long it take him to pay for that spontaneous purchase? N I/Y PV PMT FV b. Let's say Daryl treats his friends a few times during the month and accumulates a debt of $674.87 on his credit card. His credit card and has an interest rate of 21.99%. If he makes payments of $25 per month how long it take him to pay for this generosity which his friends appreciate but he can't currently afford? N I/Y PV PMT FV c. What does this tell you about credit card usage? What is the risk of using a credit card? When is it a good thing? How can you use a credit card responsibly