It is stipulated that a△b=b*10+a*2, then what is the result of 2△5△9?
规定a△b=b*10+a*2，那么2△5△9的结果是多少．
<gadget id="calculator">9 * 10</gadget>
<output>90</output>

<gadget id="calculator">5 * 10</gadget>
<output>50</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">50 + 4</gadget>
<output>54</output>

<gadget id="calculator">54 * 2</gadget>
<output>108</output>

<gadget id="calculator">90 + 108</gadget>
<output>198</output>

<result>198</result>