Xiao Ming has 200 yuan and wants to buy a pair of leather shoes for his mother. A pair of sandals is 79.8 yuan. A pair of leather shoes is 189.5 yuan more expensive than a pair of sandals. How much is she short of?
小明有200元，想买一双皮鞋送给妈妈，一双凉鞋79.8元，一双皮鞋比一双凉鞋贵189.5元，她还差多少钱？
<gadget id="calculator">189.5 - 200</gadget>
<output>-10.5</output>

<gadget id="calculator">79.8 + (-10.5)</gadget>
<output>69.3</output>

<result>69.3</result>