On most days, the price of a rose is $1, and 8,000 roses are purchased. On Valentine's Day, the price of a rose jumps to $2, and 30,000 roses are purchased.

a. Draw a demand and supply graph that shows why the price jumps.

b. Based on this information, what do we know about the price elasticity of demand for roses? What do we know about the price elasticity of supply for roses? Calculate values for the price elasticity of demand and the price elasticity of supply or explain why you can't calculate these values.