The school actually spent 120,000 yuan to renovate the lecture hall, saving 30,000 yuan compared with the plan. What percentage did you save?
学校改造阶梯教室实际用去12万元，比计划节省3万元．节省了百分之几？
<gadget id="calculator">12 + 3</gadget>
<output>15</output>

<gadget id="calculator">3 / 15</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>