The figure shows the number of cups of hot drinks sold by a cafe against the noon temperature on eight days. The line of best fit passes through the point of the means, $(24, 50)$, and its slope is $-2.5$ cups for each degree. What number of cups does the line predict for a noon temperature of $30\ ^\circ\text{C}$?

Fig. 1: A scatter plot of eight points with the horizontal axis labelled temperature in degrees Celsius from 10 to 34 and the vertical axis labelled cups of hot drinks sold from 20 to 90. The points fall from upper left to lower right, from about 86 cups at 10 degrees to 16 cups at 38 degrees. A straight red line of best fit is drawn through them.