Answer:
Most expensive in Tokyo, Least expensive in Cancun
Explanation:
Given: Exchange rates 1 $= 120 Yen
                    1$ =0.8 Euro
                    1$ = 10 pesos
Now, a bottle of beer costs in New York = 6$
                       in Tokyo = 1200 Yen i.e [tex]\frac{1200}{120}[/tex]  = 10$
                       in Munich = 7.2 Euro i.e [tex]\frac{7.2}{0.8}[/tex] = $9
                       in Cancun = 50 pesos = [tex]\frac{50}{10}[/tex] = $5
Thus, it can be seen, the beer is least expensive in Cancun, then in New York, followed by Munich and lastly most expensive in Tokyo.