Rate of return

n. ratio of money earned or lost on an investment in proportional relation to the sum of money invested (expressed as a percentage of the total sum invested)

In finance, rate of return (ROR) or return on investment (ROI), or sometimes just return, is the ratio of money gained or lost on an investment relative to the amount of money invested. The amount of money gained or lost may be referred to as interest, profit/loss, gain/loss, or net income/loss. The money invested may be referred to as the asset, capital, principal, or the cost basis of the investment.
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Calculated as the (value now minus value when you purchased) divided by the value when you purchased. For equities, we often include dividends with the value now. See also: return,  annual rate of return 

Rate of return
(Econ) Tỷ suất lợi tức.+ Một khái niệm chung nói đến số Tiền thu được từ sự đầu tư vốn, khi tiền này được coi như một phần của kinh phí.
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