In the love donation activity, the fourth grade of Guangming Primary School donated 180 yuan, which is 10% less than the fifth grade donation. How much is the fifth grade donation?
在献爱心捐款活动中，光明小学四年级捐款180元，比五年级少捐10%，五年级捐款多少元？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">180 / (9/10)</gadget>
<output>200</output>

<result>200</result>