## College Algebra 7th Edition

We know that Jack invests \$1000 at an unknown rate$r$and \$2000 at $r+0.005$. The total interest earned is \$190:$190=1000*r+2000*(r+0.005)$We solve for$r$:$190=1000*r+2000*r+10180=3000*rr=0.06\$ Thus the interest rate was 6%.