Austrian Zebra has a savings box, which stores some banknotes. According to the number of sheets, there are 2 more banknotes of 20 yuan than 50 yuan; ; In addition, there are 36 10-yuan banknotes, how many yuan did the Austrian zebras save?
奥斑马有一个储蓄箱，存放了一些纸币，按张数算，其中20元的纸币比50元的纸币多2张；按金额算，50元的总金额却比20元的总金额多500元；另外，还有36张10元的纸币，奥斑马共存了多少元钱？
<gadget id="calculator">20 * 2</gadget>
<output>40</output>

<gadget id="calculator">500 + 40</gadget>
<output>540</output>

<gadget id="calculator">540 / 30</gadget>
<output>18</output>

<gadget id="calculator">50 * 18</gadget>
<output>900</output>

<gadget id="calculator">18 + 2</gadget>
<output>20</output>

<gadget id="calculator">20 * 20</gadget>
<output>400</output>

<gadget id="calculator">10 * 36</gadget>
<output>360</output>

<gadget id="calculator">900 + 400 + 360</gadget>
<output>1_660</output>

<result>1_660</result>