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The difference between return on investment and return of investment. (You can use an example to explain)
Return OF investment - simply the repayment of your earlier investment
Return ON investment - what you make on top of your investment
Example: I invested $5,000 into Apple in exchange for 50 shares of stock. When I sold my shares I received $5,500. The return OF investment is $5,000, the amount I originally invested. The return ON investment is the $500, the amount I profited.