Suppose the Japanese yen exchange rate is $84\mathrm{.}47=$ $$1,$ and the British pound exchange rate is $1=$ $$1\mathrm{.}63.$

What is the cross$-$rate in terms of yen per pound?

Note: Do not include the yen sign $().$ Do not round intermediate calculations and round your answer to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$

Suppose the cross$-$rate is $140=1.$ What is the arbitrage profit per dollar?

Note: Do not round intermediate calculations and round your answer to $4$ decimal places, e$.$g$.,32\mathrm{.}1616.$