Question 1111903
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I = Prt<br>
The interest on $1800 for 3 years is $45 more than the interest on $1650 for 3 years:<br>
{{{1800(r)(3) = 1650(r)(3)+45}}}
{{{150(r)(3) = 45}}}
{{{450r = 45}}}
{{{r = .10}}}<br>
The interest rate is .10, or 10%.<br>
Note that the second line of the calculations shown says that the interest for 3 years on the additional $150 is $45.  It would be possible, with a bit of logical reasoning, to use that equation as your starting point for solving the problem.