Suppose the Japanese yen exchange rate is 77 = $1, and the British pound exchange rate is 1 = $1.61. a. What is the cross-rate in terms of yen per pound? (Round your answer to 2 decimal places, e.g., 32.16.) Cross-rate / 123.97 b. Suppose the cross-rate is 126 = 1. What is the arbitrage profit per dollar used? (Do not round intermediate calculations and round your answer to 4 decimal places, e.g., 32.1616.)