Suppose the Japanese yen exchange rate is 84.47 = $1, and the British pound exchange rate is 1 = $1.63.

a.	What is the cross-rate in terms of yen per pound? (Do not include the yen sign (). Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16. )
b.	Suppose the cross-rate is 140 = 1. What is the arbitrage profit per dollar? (Do not round intermediate calculations and round your answer to 4 decimal places, e.g., 32.1616.)