Bhagwanti inherited Rs 12000 . She invested part of it as 10 % and the rest at 12 %.Her annual income from these investments is Rs 1280 .How much did she invest at each rate ?

Dec 7, 2016

Let $R s . x$ was invested @10% and $R s . \left(12000 - x\right)$ was invested @12%.

So by the problem

x xx10%+(12000-x)xx12%=1280

=>12000xx12%-x xx2%=1280

$\implies 12000 \times 12 - x \times 2 = 128000$

$\implies 2 x = 144000 - 128000 = 16000$

$\implies x = 8000$

So $R s .8000$ was invested @10% and $R s . \left(12000 - 8000\right) = R s .4000$ was invested @12%.