The fruit shop buys some oranges and tangerines for a total of 591 yuan. The oranges are priced at a 25% profit and the tangerines are priced at a 20% profit. The total price is 720 yuan. How much is the purchase price of tangerines?
水果店购进一些橙和柑，进价一共591元，出售时橙按25%的利润定价，柑按20%的利润定价，一共售得720元．柑的进价是多少元．
<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">591 * (5/4)</gadget>
<output>2_955/4 = around 738.75</output>

<gadget id="calculator">(2_955/4) - 720</gadget>
<output>75/4 = around 18.75</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/4) - (1/5)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(75/4) / (1/20)</gadget>
<output>375</output>

<result>375</result>