Five centuries or fifty decades.
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41.66 years
A = Pert where… A = amount after t years at r x 100% = to be determined P = principal; initial amount = $500 r = annual interest rate, as a decimal = 5% = 0.05 t = number of years = 4 A = $500 x e(0.05 x 4) A = $500 x e0.2 A = $500 x 1.221402758 A = $610.70 ANSWER
It depends how the interest is calculated. If it's compounded, your initial 500 investment would be worth 638.15 after 5 years.
50 years is called a quintuplet
If: 500-4x = 128 then the value of x = 93 years of age