[Mcdonald's, a big burgerjoint, is charging $5 for its very famous Big Mac hamburger and selling around 20 million Big Mac in a year in Singapore] 21. [Suppose Mcdonald's increases the price of its Big Mac to $6 and still manages to sell the same quantity of the Big Mac. How much revenue will Mcdonald's gain? What can you infer about the price elasticity of demand (PED) for Mcdonald's Big Mac? Assume in an alternative scenario, the increase in the price of Big Mac to $ 6 reduces its quantity sold to 18 million. How much revenue will Mcdonald's gain now? What can you conclude about the PED now? (4 Marks)] b. [Given the two scenarios presented in part a, which one do you think is more likely and why? Present evidence in 100 words or less to support your