Mr. Wang went to the street to buy books and stationery for the school. The actual cost was 400 yuan, which was 120 yuan more than planned. Among them, the purchase of books increased by 45% compared to the original plan, and the purchase of stationery increased by 25% compared to the original plan. How much did you actually spend on buying the book?
王老师上街头为学校买书和文具，实际共用去400元，比计划多用120元，其中买书比原计划增加45%，买文具比原计划增加25%．实际买书用去多少元？
<gadget id="calculator">400 - 120</gadget>
<output>280</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">280 * (5/4)</gadget>
<output>350</output>

<gadget id="calculator">400 - 350</gadget>
<output>50</output>

<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">(9/20) - (1/4)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">50 / (1/5)</gadget>
<output>250</output>

<result>250</result>