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

a$.r=7\mathrm{.}9\%,t=15$ years.

b$.r=7\mathrm{.}9\%,t=25$ years.

c$.r=5\mathrm{.}9\%,t=15$ years.

d$.r=5\mathrm{.}9\%,t=25$ years.

Note: For all requirements, do not round intermediate calculations. Round your answers to $2$ decimal places.