[单选题]
Suppose a family has an income oju7w uk3ja0- -k;nqc)5p cqsoh +syhm2l6o)tc3d okfa(d( q 0f US $\$$50000 and it pays a tax of US $\$$15000. Calculate the average tax rate.
A. 30 %
B. 33.3 %
C. 42.8 %
D. 70 %
参考答案: A
本题详细解析: Average tax rate = $\frac{50 000}{15 000}\times100$=30%
