please show all work to the right answer

I.PROBLEMS (You have to do all of them. Each counts for 15 points for a total of 30) A The ER is reals 10. or $10 buys real. The change in the ER is what percentage wise, if at the end of the year the ER is 1/3.011111111, or $ 90 buy real 1? Show it in two ways. The one is real per dollars and the other is dollars per real. B. The Nigerian naira versus the US dollar is 7 to 1. le., 7 naira buy one dollar. The ER between the Swiss frane and the US dollar is one Swiss franc to 1.1 US S. Finally, the naira trades 7.02 per one Swiss franc. What kind of triangular arbitrage will induce a profit for you? Assume you start with ST million