Area of rectangle $=60\times 30=1800$

Area of trapezoid$=\frac{1}{2}(18+30+27+33)\times 36\times \frac{1}{2}=1944$

Area of store $1800+1944=3744$

Therefore, monthly rent $=\mathrm{\$}2\times 3744=\mathrm{\$}7488$