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Math·Advanced Math·Nonlinear functions

hard

The function $f$ is defined by $f(x)=3,950(0.38{)}^{\frac{x}{12}}$. The function $f$ gives the value, in dollars, of a certain piece of equipment after $x$ months of use. If the value of the equipment decreases each year by $p\%$ of its value the preceding year, what is the value of $p$?

A

3

B

8

C

38

D

62