Answer:
1 EUR = 120 JPY
Explanation:
As the purchasing power parity theory, the exchange rate of currency 1 to currency 2  = Cost of good  in currency 1 / cost of same valued item  in currency 2
In this case, Â a Lexus LS400 and a Mercedes C300 are considered to be of equivalent value, then the exchange rate between the yen and the euro
= price of Lexus in Tokyo/ price of Mercedes  in Stuttgart
= 6,000,000 JPY/ 50,000 EUR
= 120 JPY/EUR