In how much time would the simple interest on a certain sum be 0.125 times the principle at 10% per annum?

Answer 1

http://passyworldofmathematics.com/Images/pwmImagesFour/SimpleInterestOne550x420JPG.jpg

Use the formula given here. Plug in what you know and then solve for T. Do this for all your questions, solving for whatever you don't know.

Answer 2

I = Po*r*t = 0.125Po.
Po*0.1*t = 0.125Po.
t = 1.25 yrs. = 15 Months.