[单选题]
The annual income of x*cks-zww)ht,.nkzl e rk0h3x3 2nj1 a wwmu9y tez0 p6:dq(9ufamily is US$\$$50 000. The direct tax paid by the family is US$\$$2000, while the indirect tax paid is 10% of the disposable income. Calculate the average indirect tax rate.
