Thomas acquired $500$ shares of stock on margin at $$25\mathrm{.}50$ per share and sold all shares $($divested them$)$ six months later at $$31\mathrm{.}50$ per share. With an initial margin requirement of $70$ percent, a maintenance margin of $30$ percent, a $6$ percent interest rate on the margin loan, and no dividend income received, what was his holding period return?

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