Albert borrowed a total of $ 5800 from Brian and Charlie. He paid simple interest at the rate of 7 % Per yr and 9 % per yr respectively.At the end of three years he paid $ 1400 as total interest. What is the interest paid to Brian at the end of three years? Answers
A) 585  B) 581  C) 441  D) 431  E) 421
Let x be the amount borrowed form Brian. So amount borrowed form Charlie = 5800-x.   1400 = 21/100x + 27/100(5800-x)   =&gt;x = 16600/6.   Interest paid = 3*7/100*16600/6= 
<gadget id="calculator">3*7/100*16600/6</gadget>
<output>581</output>
581.   581
<result>B</result>
Albert borrowed a total of $ 5800 from Brian and Charlie. He paid simple interest at the rate of 7 % Per yr and 9 % per yr respectively.At the end of three years he paid $ 1400 as total interest. What is the interest paid to Brian at the end of three years?