The construction of the teaching building in the new primary school cost 900,000 yuan, which was 300,000 yuan less than planned. How much was the savings?
新建小学修建教学楼用去90万元，比计划节约了30万元，节约了百分之几？
<gadget id="calculator">30 + 90</gadget>
<output>120</output>

<gadget id="calculator">30 / 120</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>