Please provide working for every question. Thank you!

Chapter 3 Simple Interest 1. Calculate the exact and ordinary number of days: a. From 12 February 2019 to 26 August 2019 :195, 0:194 b. From 8 February 2019 to 21 November 2019 6 : 286,0: 283 C. From 19 November 2019 to 1 May 2019 e : 164,0:162 d. From 12 February 2019 to 1 January 2020 e : 323,0:911 2. Jefri intends to invest RM8000 when his son is born. He has two options; either invest in Bank A or Bank B. Bank A offers a simple interest rate of 6.1% per annum while Bank B offers a simple interest rate of 7% per annum for the first five years and simple interest rate of 5.5% for the rest of the investment period. The sum is invested for 20 years. a. Find the interest earned for each option b. Which bank should he choose to invest in? 3. A businesswoman takes a loan of RM5000 with a simple interest rate of 7% for three years. a. How much interest is charged? b. What is the amount at the end of three years? 4. Sam borrows RM7000 for 100 days at 9% per annum simple interest. What is the amount at the end of 100 days? How much is the interest charged? 5. Five years ago, Asli invested RM6600 in a bank at a simple interest rate of 7.2% per annum. Find: a. The amount in the account today b. The number of years required if Asli wants the amount in the account to become RM9537.12 6. Raihan invests RM5000 in an investment fund for threeSears. At the end of the investment period, his investment will be worth RM6125. Find the simple interest rate that is offered. 7. Twenty-four months ago, a sum of money was invested. Now the investment is worth RM12000. If the investment is extended for another 24 months, it will become RM14000. Find the original principal and the simple interest rate that was offered. 8. Muthu invests RM10000 in two accounts, some at 10% per annum and the rest at 7% per annum. His total interest for one year is RM820. Find the amount invested at each rate. 9. Ahmad deposited RM2800 in an account when he was 15 years old. The simple interest rate offered was 4.2% per annum. Find the simple interest earned when he is 21 years old. 10. Rob Andrade signed a 300-day simple interest note for $19,800 with a bank that uses exact interest. If the rate is 8 3/4 %, find the maturity value