If a certain sum of money at si doubles itself in 5 yrs then what is the rate?
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for an amount at simple interest rate r over period t)
2P = P(1 + r*t) (we want to double our money)
2 = 1 + r*t (the amount of money is irrelevant. We can divide it out.)
1 = r*t (subtract 1)
1/t = r (divide by t to find r)
1/5 = r (use the given value for t)
1/5*100% = 20% = r
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