Bicycle Sales Problem

In a city, the number of bicycles sold at a local store is described by the equation $B = 4D + 20$, where $B$ is the number of bicycles sold, and $D$ is the number of days the store has been open for sales. The demand for bicycles decreases each day given the equation $D = 60 - 2B$. How many bicycles will be sold after 5 days of operation?