The mole

A refinery removes sulfur dioxide from its exhaust gases using calcium carbonate, CaCO3). 1.50 × 10^4 mol of SO$2$ are produced each hour. The reaction uses 1 mol of CaCO$3$ for every 1 mol of SO$2$.

The molar mass of CaCO$3$ is 100 g mol$^{-1}$. If CaCO$3$ costs \$0.12 per kg, what is the cost of CaCO$3$ needed each hour?