標題:
數學題(20分)
發問:
4. A watch was marked at $1200 by a manufacturer. The watch was sold at 15% to a shopkeeper. The shopkeeper marked the price of the watch as $x and offered a 10% discount. After the shopkeeper sold the watch, he made a 20% profit. Find the value of x.
最佳解答:
Assume the watch is sold at 15% discount to the shopkeeper. Thus the price that the shopkeeper paid for the watch is $1,200 x (1 - 15%) = $1,020 Selling price of the watch = $x x (1 - 10%) = $0.9x He mades 20% profit thus 0.9x = 1020 x (1 + 20%) = 1,224 Therefore x = 1224/0.9 =1360 If the watch is sold at 15% to the shopkeeper as stated in the question. Thus the price that the shopkeeper paid for the watch is $1,200 x 15% = $180 Selling price of the watch = $x x (1 - 10%) = $0.9x He mades 20% profit thus 0.9x = 180 x (1 + 20%) = 216 Therefore x = 216/0.9 =240 Therefore x = 1224/0.9 =1360
其他解答:
x=574.6|||||576.23%|||||唔明......
此文章來自奇摩知識+如有不便請留言告知
留言列表
