Footballs are 65 yuan each, volleyballs are 40 yuan each, and you can get a 20% discount if you buy more than 10 of each type of ball. The school needs to buy 15 footballs and 20 volleyballs. How much should you pay in total?
足球每个65元，排球每个40元，每种球买10个以上可以打8折，学校要买15个足球和20个排球，一共应付多少钱？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">65 * (4/5) * 15</gadget>
<output>780</output>

<gadget id="calculator">40 * (4/5) * 20</gadget>
<output>640</output>

<gadget id="calculator">780 + 640</gadget>
<output>1_420</output>

<result>1_420</result>