Each set of science and technology books is 125 yuan, and each set of story books is 87 yuan. How much does it cost the school library to purchase four sets of each of these two books?
科技书每套125元，故事书每套87元．学校图书室购买这两种书各4套，一共花多少钱？
<gadget id="calculator">125 + 87</gadget>
<output>212</output>

<gadget id="calculator">212 * 4</gadget>
<output>848</output>

<result>848</result>