A sporting goods store buys 10 footballs and 20 basketballs for 2,600 yuan. The price of footballs is increased by 15% and the price of basketballs is increased by 10%. After selling all of them, the profit is 310 yuan. How much is the purchase price of each football?
体育用品商店用2600元购进10个足球和20个篮球，零售时足球加价15%，篮球加价10%，全部卖出后获利润310元，问每个足球的进价是多少元？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">2_600 * (1/10)</gadget>
<output>260</output>

<gadget id="calculator">310 - 260</gadget>
<output>50</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(3/20) - (1/10)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">50 / (1/20) / 10</gadget>
<output>100</output>

<result>100</result>