The bid rate and ask rate for British pound are $$1\mathrm{.}50$ and $$1\mathrm{.}60$ respectively. Compute the bid ask spread percentage.

$6\mathrm{.}67\%$

$6\mathrm{.}25\%$

$-6\mathrm{.}67\%$

$-6\mathrm{.}25\%$