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Gary learned that the value of his car depreciates by $15 \%$ of its initial purchase value each year. If the initial purchase value of Gary's car is $m$ dollars, which of the following functions best describes the value of his car one year after purchase?$\newline$Choose $1$ answer:$\newline$(A) $f(m)=0.15 m$$\newline$(B) $f(m)=0.85 m$$\newline$(c) $f(m)=1-0.15 m$$\newline$(D) $f(m)=1-0.85 m$