A store owner bought a batch of food, and in order to obtain the desired profit, he sold it at a 40% increase in the purchase price. When 90% of the food was sold, and seeing that the shelf life was about to expire, the boss decided to sell the rest of the food at a 30% discount The profit obtained in this way is of course less than expected. After calculation, the profit obtained after tax deduction (no matter what price the boss sells, the operating tax of this batch of food is 300 yuan) is 15% less than the expected after-tax profit. How much did you spend to buy this batch of food? (Note: The sum of the purchase price and business tax is taken as the cost)
某商店老板购进一批食品，为了获得希望的利润，按进价加价40%出售，当这批食物出售90%后，眼看保质期即将过去，老板决定将这批食物剩下的部分七折抛售一空，这样所得的利润当然比希望的少，经计算，扣税后(不管老板以什么价格出售，这批食品的经营税都是300元)获得的利润比希望的税后利润少15%，问购进这批食品花了多少元？(注：进价与营业税的和做为成本)
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 + (2/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">1.26 + 0.098</gadget>
<output>1.358</output>

<gadget id="calculator">(7/5) - 1.358</gadget>
<output>0.042</output>

<gadget id="calculator">0.042 / (7/5)</gadget>
<output>0.03</output>

<gadget id="calculator">(3/20) - 0.03</gadget>
<output>0.12</output>

<gadget id="calculator">300 / 0.12</gadget>
<output>2_500</output>

<result>2_500</result>