Compute the future value of a $$100$ investment for the following combinations of rates and times.

r $=6\mathrm{.}1\%,$ t $=15$ years.

r $=6\mathrm{.}1\%,$ t $=25$ years.

r $=4\mathrm{.}1\%,$ t $=15$ years.

r $=4\mathrm{.}1\%,$ t $=25$ years.