Question: how to find the time period in compound interest?
Answer: The compound interest formula is given below: Where: A is the total amount of money (including interest) after n years. ... 
Thus, let us substitute the values we have into the formula: 1152 = 800(1+0.2)^n.
We can then proceed to solve the equation: 1152/800 = (1.2)^n. 1.44 = (1.2)^n.