Seven years ago, one Swedish investor purchased $1000$ shares of a South African company Musk Industries Plc; market

price of one share was $50$ ZAR. Today the investor sold all the shares at market price of $120$ ZAR per share. Capital gain tax

rate in Sweden is $30\%.$ It is also known that bid price during that period has been constantly $10\%$ lower than market price

and ask price has been constantly $10\%$ higher than market price. Exchange rate was SEK$/$ZAR $1\mathrm{.}40$ seven years ago and

SEK$/$ZAR $1\mathrm{.}60$ today. Suppose that average annual inflation rate in Sweden during last years has been around $2\mathrm{.}25\%.$

What was average annual after$-$tax real rate of return for the Swedish investor?

$[$NB$!$ Please provide your answer in percentage terms with two decimal places. E$.$g$.$ if the answer is $50\mathrm{.}1\%$ then please type

$50\mathrm{.}10]$

Answer: