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The function C(t)=80tt+4C\(\left\)(t\(\right\))=\(\frac{80t}{t+4}\) (in ppm\(\text{ppm}\)) represents the concentration of a solution, where t≥0t\(\ge\)0 is the time in minutes. Determine the average rate at which the concentration changes over the interval [0,5][0, 5].

The function $C (t) = \frac{80 t}{t + 4}$ (in $ppm$ ) represents the concentration of a solution, where $t is greater than or equal to 0$ is the time in minutes. Determine the average rate at which the concentration changes over the interval $open bracket 0 comma 5 close bracket$ .