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butalik [34]
3 years ago
14

Lars deposited $50 into a savings account for which interest is compounded quarterly. According to the rule of 72, what interest

rate will cause his money to double in approximately 29 years?
A 0.6%
B 1.7%
C 2.5%
D 0.4%
Mathematics
2 answers:
MA_775_DIABLO [31]3 years ago
4 0

Answer:

2.5% --APEX

Step-by-step explanation:

Ivanshal [37]3 years ago
3 0

Answer: C 2.5%


Step-by-step explanation:

The "Rule of 72" is a easy way to calculate how much time an investment will take to double with a given fixed annual rate of interest.

Just we have to divide 72 by the annual rate of return(r), we can get a rough estimate of how many years it will take to double the initial investment .

Now, in given problem: Let 'r' be the rate of interest

Time to double the amount=29 years

Thus by rule 72 ,

\frac{72}{r}=29\\\Rightarrow\ r=\frac{72}{29}=2.4827\%\approx2.5\%

Therefore, C is the right option.


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Citrus2011 [14]

Answer:

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Step-by-step explanation:

<u>Arithmetic Sequences</u>

The arithmetic sequences are identified because any term n is obtained by adding or subtracting a fixed number to the previous term. That number is called the common difference.

The equation to calculate the nth term of an arithmetic sequence is:

a_n=a_1+(n-1)r

Where

an = nth term

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r   = common difference

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We are given the first terms of a sequence:

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The first term is a1 = -12. Now we calculate the term n=61:

a_{61}=-12+(61-1)(-16)

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6 0
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