Find the minimum possible forward rate $($in $$/,$ assuming there is no bid$-$ask spread

on the forward market$),$ in spot exchange bid$-$ask rates are $1\mathrm{.}55-1\mathrm{.}57$$$/,$ you can freely

invest $s and $$s at $5\%$ and $7\%$ respectively while your borrowing rates in $s and $$s are

$5\mathrm{.}5\%$ and $8\%$