 Hello and welcome to the session. In this session we discuss the following question which says in how many years will rupees thousand amount to rupees 1100 at 10% per annum when compounded annually. Let's recall the formula for the amount a is equal to p into 1 plus r upon 100 whole to the power n where this p is the principle r is the rate of interest and n is the time. This is the key idea to be used for this question. Now we move on to the solution. Since we are required to find the number of years in which rupees thousand will amount to rupees 1100 at 10% per annum compounded annually. So we take let the required time be n years we are given the principle p equal to rupees thousand amount a equal to rupees 1100 rate of interest r is equal to 10% per annum and we need to find the time that is n. Now putting these values in the formula for amount we get 1100 is equal to thousand into 1 plus r that is 10 upon 100 whole to the power n that is we have 1100 upon 1000 is equal to 110 upon 100 whole to the power n. Now these two zero cancels with these two zero this zero cancels with this zero and we have 11 upon 10 is equal to 11 upon 10 whole to the power n that is we have 11 upon 10 to the power 1 is equal to 11 upon 10 to the power n. So from here we get n is equal to 1. So the required time is equal to 1 year. So our final answer is 1 year. So this completes the session hope you have understood the solution for this question.