11. Mr. Bautista aims to have his investment grow to Php. 500.000 in 4 years. How much should he invest in an account that pays 5% compound annually?  

12. How long will it take Php. 1,000 to earn Php. 300 if the interest rate is 12% compounded semi-annually.

13. Grace barrowed Php. 150,000 payables in 2 years. To repay the loan, she must pay an amount every month with an interest rate of 6% compounded monthly. How much should he pay every month?