The compound interest is 8.775%.
interest = p.
p is principal, i is the interest rate, and n is the periods. Inthis case, p is 2 and the interest is .8. (We can divide both sides by a million to make it simpler.) The number of periods is 4.
.8 = (2)(i)(4)
.8 = 8i
i = 10%. (solution)
Compound interest, again, is
interest = p [(1+r)^m - 1]
This time we can't cancel out the p by default. We must divide by 2if we want to avoid multiplying through. After doing so, we add 1to both sides.
1.4 = (1+r)^4
Log both sides.
log(1.4) = 4log(1+r)
log(1.4) / 4 = .0365 = log(1+r)
10^.0365 = 1 + r
1.08775 - 1 = r
r = 8.775%.
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