Given $f^{-1}(x)=400(1.02)^{x}$ , What Is $f(x)$ ?
A) $\frac{\sqrt[x]{1.02}}{400}$ B) $1.02 \sqrt[x]{400}$ C) $\frac{\ln (x)-\ln (1.02)}{\ln (400)}$

Multiple Choice

Given $f^{-1}(x) =400(1.02) ^{x}$ , what is $f(x)$ ?

A) $\frac{\sqrt[x]{1.02}}{400}$
B) $1.02 \sqrt[x]{400}$
C) $\frac{\ln (x) -\ln (1.02) }{\ln (400) }$
D) $\frac{\ln (x) -\ln (400) }{\ln (1.02) }$