shopping mall offers discounts to customers. If a purchase does not exceed 200 yuan, no discount will be given; if a purchase exceeds 200 yuan but does not exceed 500 yuan, a 10% discount will be given; if a purchase exceeds 500 yuan, a 10% discount will be given for 500 yuan. , More than 500 yuan part of the 20% discount. Aunt Wang and Aunt Li spent 150 yuan and 423 yuan on shopping respectively. If they buy the same product together, how much money can they save?
某商场对顾客实行优惠，若一次购物不超过200元不予优惠；若一次购物超过200元，但不超过500元则打九折优惠；若一次购物超过500元，其中500元按照九折优惠，超过500元的部分打八折．王阿姨和李阿姨两人购物分别花了150元和423元，如果两人合起来购买同样的商品，可以节省多少元？
<gadget id="calculator">150 + 423</gadget>
<output>573</output>

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

<gadget id="calculator">500 * (9/10)</gadget>
<output>450</output>

<gadget id="calculator">423 / (9/10)</gadget>
<output>470</output>

<gadget id="calculator">150 + 470</gadget>
<output>620</output>

<gadget id="calculator">620 - 500</gadget>
<output>120</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">120 * (4/5)</gadget>
<output>96</output>

<gadget id="calculator">450 + 96</gadget>
<output>546</output>

<gadget id="calculator">573 - 546</gadget>
<output>27</output>

<result>27</result>