Investment problems

Question

$13,666 invested at 10% and the rest at 6%. if interest earned from amount invested at 10% exceeds the interest earned at amount invested at 6% by $659.56, how much is invested at each rate?

Answer 1

Amount = Principal x Rate x Time            .10 x 13666 = 1366.6     1366.6 - 659.56 = 707.04 interest amount at 6%

 

$707.04 = .06P  Divide both sides by .06      11784 = Principal invested at 6%

 

They have already told us that $13666 is invested at 10%.