A professional household spent 250 yuan to buy seeds, 2.4 times more money to buy agricultural tools than to buy seeds, and 78 yuan more to buy chemical fertilizers than to buy farm tools. How much did it cost to buy chemical fertilizers?
某专业户买种子用去250元，买农具的钱数是买种子的2.4倍，买化肥比买农具多用78元，买化肥用去多少元？
<gadget id="calculator">250 * 2.4</gadget>
<output>600</output>

<gadget id="calculator">600 + 78</gadget>
<output>678</output>

<result>678</result>