Appendix A - Arithmetic and Algebra Review - Pretest - Page 368: A.31

$33 \frac{1}{3}$%

Make a proportion and cross-multiply, then divide. $12=\frac{x}{100}\cdot 36$ $\frac{12}{36}=\frac{x}{100}$ $12\times100 = 1200$ $1200\div36 =\frac{1200}{36}==\frac{100}{3}=33 \frac{1}{3}$ Then turn $33 \frac{1}{3}$ into a percent.