a. If the price increases from $4 to $8, by how much does the quantity demanded decline? unit(s) b. If a successful advertising campaign increases the quantity demanded at every price by 4 units, (i) draw the new demand curve D2. Instructions: Use the tool provided 'D2' to draw a new market demand curve on the graph above. Include each price-quantity combination (plot 10 points). (ii) how many units are now purchased at $8? unit(s)