During the promotion of the home appliance store, Aunt Wang bought a microwave oven for 450 yuan, 50 yuan less than usual. How much is the price cheaper?
在家电商场促销活动期间，王阿姨花了450元买了一个微波炉，比平时少花50元．价格便宜了百分之几？
<gadget id="calculator">450 + 50</gadget>
<output>500</output>

<gadget id="calculator">50 / 500</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>