Xiaoming's father invested 120,000 yuan to set up a factory, which is 30,000 yuan less than the planned investment. How much was the savings?
小明的爸爸投资办厂，实际12万元，比计划投资节省了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>