Amount after Compound Interest =principle*(1+(interest rate/100))^(no of compounds) = 640*(1+(50/3))^(11/4) =977.88. Therefore Compund interest = principle - amount = 977.88 - 640 = 337.88
How much times (in years) will it take for an amount of Rs. 450 to yield Rs. 162 an interest at 4.5% per annum of simple interest?