Suppose the demand for pizza is given by Q=40-2P and the supply of pizza is given Q=P-8. if the price of pizza is $19, which of the following is true?
a. there will be excess demand of 8 pizzas
b. there will be excess demand of 10 pizzas
c. there will be excess demand of 6 pizzas
d. there will be excess demand of 9 pizzas