please show how to compute step by step

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Suppose the Japanese yen exchange rate is yensign 76 = $1, and the British pound exchange rate is poundsign 1 = $ 1.60. a. What is the cross-rate in terms of yen per pound? Cross-rate yensign/ poundsign = b. Suppose the cross-rate is yensign 125 = poundsign 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.) Arbitrage profit $