Answer
Interest is greater by about $\$9.26$ at $6\%$ compared with $4\%$
Work Step by Step
The Future Value formula is
$FV=PV\times (1+r)^t$
We are given $PV=100, t=4, r_1=0.04, r_2=0.06$.
We determine FV for $r_1$:
$FV_1=100\times (1+0.04)^4\approx 116.99$
The total interest is:
$116.99-100=16.99$
We determine FV for $r_2$:
$FV_2=100\times (1+0.06)^4\approx 126.25$
The total interest is:
$126.25-100=26.25$
Now we calculate the difference in total interest:
$26.25-16.99=9.26$
