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22-12-2018
Mathematics

contestada

Helena deposited $89 into a saving account. According to the rule of 72 what interest rate will cause her money to double in approximately 38 years

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chloe8668 chloe8668

22-12-2018

89×2=89(1+r)^38
(89×2)/89=(1+r)^38
2=(1+r)^38
[tex] \sqrt[38]{2} = 1 + r[/tex]
r=0.018
Interest rate:1.8%

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drunkelmo04 drunkelmo04

31-01-2019

Answer:

1.9% apex

Step-by-step explanation:

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