The Following Is Dave's Demand Schedule for Music Downloads If a Firm Is Selling Downloads at $1

Essay

The following is Dave's demand schedule for music downloads:
$\begin{array} { | l | l | } \hline \text { Quantity } & \text { Price } \\\hline 1 & 2.50 \\\hline 2 & 2.00 \\\hline 3 & 1.50 \\\hline 4 & 1.00 \\\hline 5 & 0.50 \\\hline\end{array}$
If a firm is selling downloads at $1.00 and then Dave obtains a promotional code that allows him to download for $0.50 each, what is the gain in consumer surplus to Dave?