TeX source:

\left(\dfrac{3 \mathrm{Rx}}{1}\right)\left(\dfrac{60 \mathrm{tab}}{1 \mathrm{Rx}}\right)\left(\dfrac{4 \mathrm{mg}}{1 \mathrm{tab}}\right)\left(\dfrac{1 \text { dose }}{12 \mathrm{mg}}\right)