8.) Dennis invested ₱15,600.00 at a 10.25% interest rate. How long will it take for his investment to earn an interest of ₱5,055.00?
9.) At what interest rate compounded semi-annually will ₱15,000 accumulate to ₱25,000 in 10 years?
10.) University of West anticipates additional expenses of ₱785,000 for new equipment needed for offering a new course 5 years from now. How much should be invested in an account that earns 2% compounded monthly?