Uncle Wang rented out the house and obtained a rent of 1,800 yuan, and should pay a tax of 90 yuan. What is the tax rate for renting out housing?
王大爷出租房屋获得了1800元租金，应缴纳90元的税款．出租房屋缴纳税款的税率是多少．
<gadget id="calculator">90 / 1_800</gadget>
<output>1/20 = around 0.05</output>

<result>1/20 = around 0.05</result>