National Day promotions in home appliance shopping malls, all refrigerators are sold at a 10% discount. How much money can Xiao Ming's father save by buying a refrigerator whose original price is 3,500 yuan?
家电商场国庆促销，冰箱一律九折销售．小明的爸爸买一台原价为3500元的冰箱能节省多少元钱．
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 - (9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">3_500 * (1/10)</gadget>
<output>350</output>

<result>350</result>