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MissPhiladelphia

For the answer to the question above, it is -18% because to find rate we subtract the rate, in this case, is .82 or 82% - 1 or 100% and that would give you the rate, in this case, its decreasing by an 18%
I hope my answer helped you.

Answer:

The rate of interest is 18%.

Step-by-step explanation:

The exponential function for the compound interest is \(A(x)=P(0.82)^x\)

That is, \(A(x)=P(1-0.18)^x\)

As we know,

The compound interest is given by \(A=P(1+r)^x\), where r = rate of interest.

On comparing, we get that,

The rate of interest is 0.18 i.e. 18%.

Hence, the rate of interest is 18%.

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