Please answer by providing formula then detail calculation
please answer correct , otherwise skip it
16. You invested $9180 in an account that was earning a Simple interest at a rate of 3.75% pa. How many months did it take for his investment to earn an interest of $172.10?
23. Harry invested his savings in an account at 2.5%p.a. simple interest for 9 months. if he earned an interest of $37.50 at the end of the term, what was the principal amount of investment?
