The actual investment in the new teaching building of Yucai School was 1.8 million yuan, which was 200,000 yuan less than the plan. How much was the savings?
育才学校新教学楼实际投资180万元，比计划节约了20万元，节约了百分之几？
<gadget id="calculator">180 + 20</gadget>
<output>200</output>

<gadget id="calculator">20 / 200</gadget>
<output>1/10 = around 0.1</output>

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