# Thread: Can anyone help me with my math extra credit? Using the simple interest formula I=prt

1. ## Can anyone help me with my math extra credit? Using the simple interest formula I=prt

Tom made $190.00 interest after investing$5,500 for one year. part was invested @ 5.5% with the rest @ 3%. Using a Mixture Equation calculate the amount invested at each rate.

2. Originally Posted by fzwarrior
Tom made $190.00 interest after investing$5,500 for one year. part was invested @ 5.5% with the rest @ 3%. Using a Mixture Equation calculate the amount invested at each rate.
let $x$ = interest earned

$y$ = amount of investment

$I = prt$

$x = y(.055)(1)$

$(190-x) = (5500-y)(.03)(1)$

solve the system for $y$ and $(5500 - y)$