Chapter 1 - Foundations for Algebra - 1-3 Real Numbers and the Number Line - Practice and Problem-Solving Exercises - Page 21: 61

$\frac{306}{100}$

0.06 is equal to $\frac{6}{100}$. We now must write 3 in terms of a fraction with a denominator of 100. $\frac{300}{100}$ equals 3, so we add $\frac{300}{100}$ and $\frac{6}{100}$ to obtain our answer of $\frac{306}{100}$. Because this number can be written as a fraction, it is rational.