The canteen of Sunshine Elementary School is going to provide each student with a teacup at 4 yuan per teacup. Wenfeng Supermarket offers a 10% discount. One hundred yuan cash back one hundred yuan" discount. The school wants to buy 270 teacups, please be an advisor and do the math: which one is more cost-effective to buy? How much is it?
阳光小学食堂准备为在校就餐的学生每人配一个茶杯，每只茶杯4元，文峰超市打九折，百货商店进行"买八送一"的促销，而华联超市实行"每满五百元返还现金一百元"的优惠．学校想买270只茶杯，请你当参谋，算一算：到哪家购买较合算？需要多少钱？
<gadget id="calculator">270 * 4</gadget>
<output>1_080</output>

<gadget id="calculator">1_080 - 200</gadget>
<output>880</output>

<result>880</result>