stationery store sells a kind of electronic dictionary. It can make a profit of 15 yuan for each one sold. After 80% of the sales, in order to recover the funds as soon as possible, the price of each dictionary is reduced by 3 yuan. When all are sold out, the total profit is 864 yuan. How many electronic dictionaries have been sold in the stationery store?
某文具店出售一种电子词典，每售出一部可获得利润15元，售出80%后，为了尽快回收资金，每部降价3元，当全部售完后，共利润864元．文具店共卖出这种电子词典多少部？
<gadget id="calculator">12 / 5</gadget>
<output>12/5 = around 2.4</output>

<gadget id="calculator">12 + (12/5)</gadget>
<output>72/5 = around 14.4</output>

<gadget id="calculator">864 / (72/5)</gadget>
<output>60</output>

<result>60</result>