Suppose that ex is the exchange rate between the U.S. dollar and the Chinese Yuan in that ex indicates the number of Yuan that can be purchased with one dollar. The demand for dollars, denoted, D$, is given by the equation D$ = 2800 - 200ex. The supply of dollars denoted, S$ is given by the equations S$ = 400 + 100ex

a) find out the demand for dollars and supply of dollars at the exchange rates between 0 and 12 in increments of one.

b) Graph the demand for dollars and supply of dollars against the exchange rate. What is the value of the equilibrium exchange rate

c) Suppose the demand for dollars increases by 300 billion at each exchange rate. describe if the increase in demand results from a large purchase by the Chinese of a new American made airplane or a large purchase by the Americans of new lower priced Chinese made high definition televisions. find out the new demand for dollar at each exchange rate give the original supply of dollars?

d) Supposed the supply of dollar increases by 600 billion at each exchange rate. describe if the increase in supply results from a large purchase by the Chinese of a new American made airplane or a large purchase by the Americans of new lower priced Chinese made high definition televisions. find out the new supply of dollars at each exchange rate and graph the new supply curve. What is the new equilibrium exchange rate given the original demand for dollars?