For Xiaohua's birthday, he needs 39 yuan to buy snacks and 46 yuan to buy fruit. He pays the salesperson 100 yuan. How much should he get back? (calculated in two ways)
小华过生日，买零食需要39元，买水果又需要46元，他付给售货员100元钱，应找回多少元？(用两种方法计算)
<gadget id="calculator">100 - 39 - 46</gadget>
<output>15</output>

<result>15</result>