標題:
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發問:
A bookshop sold all the books at 20% discount in a summer sale. If a costumer paid with a credit card, he or she needed to pay an extra service charge of 3%. Eric bought 8 books and the total marked price was $425. How much did he pay if he use a credit card? 更新: ( 請用中文解釋+ 計算)
最佳解答:
A bookshop sold all the books at 20% discount in a summer sale. If a costumer paid with a credit card, he or she needed to pay an extra service charge of 3%. Eric bought 8 books and the total marked price was $425. How much did he pay if he use a credit card? 你可以先計這這書折扣後的價錢： 425 x (1 – 20%) = 340元 再加 3% 的信用卡收費： 340 x (1 + 3%) = 350.2元 所以他用信用卡要付 350.2元
其他解答:
你可以先計這這書折扣後的價錢: Selling price of the book after the discount. 425 - ( 425 x 20%) = 425 x (1 – 20%) = 425 x 80% = ($340) 加 3% 的信用卡收費：Selling price of the book after add an extra service charge of 3% 340 + (340 x 3%) = 340 x ( 1+3%) = 340 x 103% = ($350.2) 所以他用信用卡要付 350.2元 He paid $350.2 if he used a credit card. 成條式就係咁.. 425 x ( 1-20%) x (1+3%) = 425 x 80% x 103% = ($350.2) He paid $350.2 if he used a credit card.|||||好容易! Eric用credit card被錢要被多3% 咁我地先計下d book discount完幾錢: $425(1-0.2or20%)= $340 之後計佢用cedit card要幾錢啦: $340(1+0.03or3%)= $350.2 成條式係 $425(1-20%)(1+3%)=$425(80%)(103%)= $350.2|||||Eric need to pay if he use a credit card =$425 x (1 - 20%) x (1 + 3%) =$350.2 首先$425 x (1 - 20%)是要計出selling price (1 + 3%)是加上了 extra service charge 。 很易計|||||$425x(1-20%) 就等於discount後既selling price, 咁就會計到個selling price系$340. $340x(1+3%)就會係加埋extra service charge 個3%之後既price 所以成條式就系: 425x(1-20%)x(1+3%)!! 答案應該計到系$350.2~960E6207A465286D
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