A bakery would be willing to supply 500 bagels per day at a price of $0.50 each. At a price of $0.80, the bakery would be willing to supply 1,100 bagels. Using the midpoint method, the price elasticity of supply for bagels is about
a. 0.62.
b. 0.77.
c. 1.24.
d. 1.63.