Consider:

$($a$)$ Stock trades for $$100$;

$($b$)$ Calls with exercise prices of $$90,$ $$100,$ and $$110$ trade at prices of $$16\mathrm{.}51,$ $$11\mathrm{.}72,$ and $$7\mathrm{.}64$ respectively.

If a person buys a $$90$ call and writes a $$110$ call, what is her profit if the stock price is $93\mathrm{.}9$ at maturity? Please answer correctly up to two decimal places.

You Answered

$-3\mathrm{.}74$

Correct Answer

$-4\mathrm{.}97$ margin of error $+/-0\mathrm{.}01$