Mike acquired a data plan for his smart phone. Every month he pays a flat rate of $ \$ 30$ and an additional $ \$ 0.05$ for every megabyte he goes over his monthly limit. Which of the following represents Mike's monthly data bill when he goes over his limit by $n$ megabytes ?

Question

$\begin{array}{1 1} (a)\; 30+1.05n \\ (b)\; 30+0.05n \\ (c)\; 0.05(30+n) \\ (d)\; 1.05 (30+n) \end{array}$