The store has bought a batch of toys, and the profit of selling 30 toys at a retail price of 12 yuan is the same as selling 20 toys at a retail price of 15 yuan. So how much is the purchase price of each toy?
商店进了一批玩具，用零售价12元卖出30个与用零售价15元卖出20个的利润相同．那么每个玩具的进货价是多少元？
<gadget id="calculator">12 * 30</gadget>
<output>360</output>

<gadget id="calculator">15 * 20</gadget>
<output>300</output>

<gadget id="calculator">360 - 300</gadget>
<output>60</output>

<gadget id="calculator">30 - 20</gadget>
<output>10</output>

<gadget id="calculator">60 / 10</gadget>
<output>6</output>

<result>6</result>