On the Day When Julie Left for Her Vacation, the Function

Multiple Choice

On the day when Julie left for her vacation, the function that converted U.S. dollars to British pounds was f(x) = 0.54521 x , where x is the number of U.S. dollars and f(x) is the number of British pounds. Find the inverse function.

A) $f ^ { - 1 } ( x ) = \frac { x } { 0.54521 }$
B) $f ^ { - 1 } ( x ) = x - 0.54521$
C) $\mathrm { f } ^ { - 1 } ( \mathrm { x } ) = \frac { 0.54521 } { \mathrm { x } }$
D) $\mathrm { f } ^ { - 1 } ( \mathrm { x } ) = \frac { 1 } { 0.54521 \mathrm { x } }$