Figure 7.4 -Figure 7.4 Shows Prices, Demands, and Cost Data for the for the Only

Figure 7.4
-Figure 7.4 shows prices, demands, and cost data for the only restaurant in a small town. Compared to the profit under the single price policy, how much additional profit does the restaurant earn under the senior discount policy of a $7 senior price and a $10 non-senior price?

A) $920
B) $580
C) $300
D) $280