The equation for the projected cost C is as follows:
[tex]C=C_{0}(1+r)^{t}[/tex]
where Co is the current cost, r is the rate of increase as a decimal and t is the time in years.
Plugging in the given values, we get:
[tex]C=27000(1+0.05)^{4}=$32,818.67[/tex]