Given,
Present value = $1
Future value = $10
Interest rate = 6.3% or 0.063
Solution :-
Monthly interest rate (r) = 0.063 x 1/12 = 0.00525
Let no. of months be 'n'
Future value = Present value x (1 + r)n
$10 = $1 x (1 + 0.00525)n
$10/$1 = (1.00525)n
$10 = (1.00525)n
Taking 'Log' both sides,
Log(10) = Log(1.00525)n
Log(10) = n.Log(1.00525)
2.302585093 = n.(0.0052362668)
2.302585093 0.0052362668 = n
439.737924163 = n
So,
No. of years = n 12 months
= 439.737924163 12 months = 36.64 years
Thus, it will take 36.64 years to grow $1 to $10
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