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Stock options are one of the riskiest and potentially lucrative financial instruments available to investors. Stock options

give the investor the right to buy or sell a particular stock for a stated price within a specified period of time. For example,

on December $20$th$,$ an investor who believed that the stock of Apple Computer, Inc. was underpriced at $$172\mathrm{.}04,$ could

buy an option to purchase $100$ shares of Apple for $$175\mathrm{.}00$ per share at any time until December $31$st$.$ The price of the

option was $$2\mathrm{.}85$ per share. Assume the investor purchased the option for $$285\mathrm{.}00$ and Apple stock rose to $$180\mathrm{.}35$ on

Dec $23$rd$.$ Further, assume the investor exercised the option and bought the stock for $$175\mathrm{.}00$ per share on Dec $23$ rd and

immediately sold the stock for $$180\mathrm{.}35$ per share.

What rate of return did the investor make in $3$ days from Dec $20$th to the $23$rd$?($Round the final answer to two decimal places.$)$

The rate of return is