When the difference between C.I and S.I given then \\\\(\ ext{Sum}\\;=\\;\ ext{difference}\\left(\\dfrac{100}{r}\\right)^2\\\\).Given difference is \\\\( Rs.\\;144\\\\).Rate of interest is \\\\(15 \\;\\%\\\\)\\\\(\\begin{array}{}{\\rm{Sum}} &= 144 \ imes {\\left( {\\dfrac{{100}}{{15}}} \\right)^2}\\\\ &= 144 \ imes \\dfrac{{10000}}{{225}}\\\\&=6400\\end{array}\\\\)