During the National Day period, all products in the store celebration feedback activities of Hangzhou Tower will be reduced by 20%, and mothers who have a preferential gold card can enjoy an additional 10% discount. Mom took a fancy to a "Islay" long down jacket with a price tag of 1,780 yuan. How much should I pay in the end?
国庆期间，杭州大厦店庆回馈活动一律商品降价20%，妈妈有优惠金卡，还可以再打九折．妈妈看中一件"艾莱依"长款羽绒服标价1780元，最终应付多少钱？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1_780 * (4/5) * (9/10)</gadget>
<output>6_408/5 = around 1_281.6</output>

<result>6_408/5 = around 1_281.6</result>