All you need to grow a one-time investment of R100 000 to R1.7-million is time and the power of compound interest. Ryan McCaughey, executive head of the Cape Town branch of financial planning firm Hewett Wealth, says that to earn R1.7-million you would need to reinvest the interest you earn each year on your R100,000 and to remain invested at a rate of 10% a year for 30 years. To benefit from the power of compound interest, which will allow regular saving of quite small amounts to accumulate to a large sum of money, the sooner you start saving, the better, he says. Any savings account or investment that earns interest or dividends delivers compound interest - if the interest or dividends are reinvested. The power of compound interest comes from interest being earned on the interest or on the dividends. According to McCaughey, delayed saving can have a dramatically adverse effect, as illustrated by the following fictitious case study. Don't delay Jean invests R10,000 a year over 10 y...

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