A Tesla Model 3 car is sold in Indonesia for IDR 1.5 billion and US$ 35,000 in the United States. If the nominal exchange rate of the Rupiah is currently at the level of IDR 14,040.15 per as$: 

a. What is the real exchange rate of the Rupiah against the US$? Is there an arbitrage opportunity in this? (10 points) 

b. Calculate the nominal exchange rate of the Rupiah against the US$ when purchasing power parity applies. (5 points)