An agricultural economist estimated the following linear demand function

An agricultural economist estimated the following linear demand function for milk in Queensland: Q = 816 - 22.4P

where Q represents the number of two litre milk bottles demanded per day in thousands and P represents the price of these bottles in dollars. If on a given day the two litre milk bottle retails for $3.39, predict the number of two litre milk bottles demanded in thousands (to nearest whole thousand).