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Determine the cost of the investment. This is the original price paid. Let's say you purchased 100 shares of stock for $1,000.

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Calculate the current price of the stock. This is the current value of the asset. For instance, let's say the value of your stock position has grown to $1,200 in one year.

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Determine any additional income paid out over the year from the asset. Common forms of income are interest or dividends. Let's say your stock paid a $1 dividend on all stock. The calculation for additional income is: $100 x $1 = $100.

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Calculate total investment earnings over the year. Add the asset price appreciation to any additional income. The calculation is ($1,200 - $1,000) + $100 = $300.

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Divide total investment returns for the year by the original cost of the asset: $300 / $1,000 = .3 or 30 percent.