1) Let us write by calculating the number of yrs for which the interest of Rs 600 at the rate of Simple Interest of 8% per annum will be Rs 168. . Created by Rudranil420. Math

Solution : Let us assume that the number of years for which the interest is compounded is x years . The interest which is being calculated here is Simple Interest . The rate of the simple interest is 8% per annum . The given principal invested is Rs. 600 . The required interest obtained is Rs. 180 As we know , In Simple Interest : SI = [ Principal × Rate × Time period ]/100 => SI = [ 600 × 8 × t]/100 => SI = 48t SI = 168 => 3.5 years . Thus , the required time period is 3.5 years . This is the answer. ________________________________________Additional Information : In compund interest A = P ( 1 + r/100)^t Where p is the principal r is the rate percentt is the time period A is the amount ________________________________________