The actual investment of a project is 180,000 yuan, saving 20,000 yuan compared with the original plan. How many percent was saved.
一项工程实际投资18万元，比原计划节约2万元．节约了百分之多少．
<gadget id="calculator">18 + 2</gadget>
<output>20</output>

<gadget id="calculator">2 / 20</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>