If a firm is quoting a security at $$15$ bid, $$15\mathrm{.}75$ offer, and the inside

market is $$15\mathrm{.}15$ bid, $$15\mathrm{.}65$ offer, when the firm sells the security to a

customer at $$16\mathrm{.}20,$ the markup would equal:

A $2\mathrm{.}86\%$

$3\mathrm{.}57\%$

$6\mathrm{.}93\%$

$8\%$