A supermarket launched a 20% discount on bedding. If you pay with mobile phone Alipay, you will get another 10% discount. Aunt Zhang is going to buy supplies with an original price of 500 yuan. How much does it cost to pay with mobile phone Alipay? How much is it equivalent to?
某超市推出床上用品打八折的促销活动，如果用手机支付宝支付，再打九折，张阿姨准备买原价500元的用品，用手机支付宝支付需要多少元？相当于几折？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">500 * (4/5) * (9/10)</gadget>
<output>360</output>

<result>360</result>