I need help understanding this. I cannot figure out the correct formula to figure out questions like this. Can you please show the work needed so that I can better understand this? Like EXPLAIN it? I don't want just the answers but to be able to better understand. Thanks for your help.

[4 pts] Find the present value of an investment that is worth $19,513.75 after earning 3% simple interest for 5 = years. [4 pts] Mr. Clopu buys an 18-month CD that pays 4~% simple interest for $5,000. Find the value of the CD at the end of its term. [4 pts] Find the maturation value of $2600 borrowed at 3.9% simple interest for 200 days. The table below shows the activity on the credit card statement of Miss Pepper Mills for the month of April. She started the month with a balance of $342.57. Date Activity Location Amount 04/05 Payment Payment $200.00 04/15 Charge Gas $26.37 04/22 Charge Macy's $105.42 04/25 Charge Starbuck's $4.24 a. [4 pts] Find the average daily balance. b. [4 pts] If her card charges an 18.5% annual interest rate on her average daily balance, calculate Miss Pepper Mill's finance charge for the month of April