A person invested in all Rs. 2600 at 4%, 6% and 8% per annum simple interest. At the end of the year, he got the same interest in all the three cases. The money invested at 4% is?  Choose the most appropriate option.
A) 3888 B) 2799 C) 2799 D) 1200 E) 2771
Let the parts be x, y and [2600 - (x + y)].   Then,   (x * 4 * 1)/100 = (y * 6 * 1)/100 = {[2600 - (x + y)] * 8 * 1}/100   y/x = 4/6 = 2/3 or y = 2/3 x   So, (x * 4 * 1)/100 = [(2600 - 5/3 x) * 80/100   52x = (7800 * 8) =&gt; x = 1200   Money invested at 4% = Rs. 1200.Answer:1200
<result>D</result>
A person invested in all Rs. 2600 at 4%, 6% and 8% per annum simple interest. At the end of the year, he got the same interest in all the three cases. The money invested at 4% is?