It costs 3100 yuan to buy a computer and 150 yuan to buy a computer desk. If you buy one set, you can get a 10% discount. How much is the total cost of a certain fund giving two sets to the school (1 set = 1 computer + 1 computer desk)?
买一台电脑3100元，一台电脑桌150元．若买一套可打9折，某基金送给学校2套(1套=1台电脑+1张电脑桌)共花多少元？
<gadget id="calculator">3_100 + 150</gadget>
<output>3_250</output>

<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">3_250 * (9/10) * 2</gadget>
<output>5_850</output>

<result>5_850</result>