The school bought 4 computers at 2,300 yuan each. It cost 9450 yuan to buy 45 sets of desks and chairs. How much less does it cost to buy a computer than to buy a desk and chair?
学校买来4台电脑，每台2300元．又买来45套办公桌椅花了9450元．买电脑比买办公桌椅少花多少元钱？
<gadget id="calculator">2_300 * 4</gadget>
<output>9_200</output>

<gadget id="calculator">9_450 - 9_200</gadget>
<output>250</output>

<result>250</result>