The $90-$day US T$-$bill rate is $4\mathrm{.}9\%$ APR and the $90-$day British Treasury rate is $5\mathrm{.}05\%$ per annum.

The spot exchange rates are. $$\frac{1\mathrm{.}3505}{}$ bid and $$\frac{1\mathrm{.}351}{}$ ask.

Calculat$,$ to $4$ decimal places $($e$.$g$.$ $$1.$####$/),$ the $"$no$-$arbitrage" $90-$day forward ask exchange rate that makes a British citizen indifferent between buying a UK treasury and buying a US T$-$bill.