A Dilution Ratio Can Indicate the Concentration of a Solution $\frac { 1 } { 40 }$

A dilution ratio can indicate the concentration of a solution and many times is expressed as a percent. What is the percent concentration of a solution having a dilution ratio of $\frac { 1 } { 40 }$ ?

A) 0.025 $\%$
B) 2.5 $\%$
C) 0.25 $\%$
D) 25 $\%$
E) 1.25 $\%$