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01.02.2020 •
Mathematics
Where r is written as a decimal. what is the formula for the interest rate, r; required to achieve a balance of b in the account after 3 years?
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Ответ:
Option b
r = -1 + (∛B/10)
Step-by-step explanation:
Given in the question that formula to calculate future amount B, after 3 years if principal amount 1000 is deposit with interest rate r is
B = 1000(1+r)^3
B/1000 = (1+r)^3
∛(B/1000) = 1 + r
∛B/∛1000 = 1 + r
∛B/10 = 1 + r
(∛B/10) - 1 = r
r = -1 + (∛B/10)
So formula to calculate interest rate, r is = -1 + (∛B/10)Ответ: