標題:
此文章來自奇摩知識+如有不便請留言告知
maths question -- urgent
發問:
a store made an initial profit by selling a coke was $1.8. After 4/10 of the coke had been sold, the store reduced the price of each coke by $1.5. It is given that if all the cokes were sold, the store made an overall profit of $300.If only a further 50 cokes were sold after the price reduction and the rest... 顯示更多 a store made an initial profit by selling a coke was $1.8. After 4/10 of the coke had been sold, the store reduced the price of each coke by $1.5. It is given that if all the cokes were sold, the store made an overall profit of $300. If only a further 50 cokes were sold after the price reduction and the rest were discarded, and the store made an overall profit per cent of 30%, find the total cost of the cokes.
最佳解答:
let the total cost of the cokes is $ x and y be the total number of cokes 1.8 (4/10) y + 1.5 (6/10) y - x = 300 0.72y + 0.9y - x = 300 1.62y - x = 300 y = (x + 300) / 1.62 1.8 (4/10) y + 1.5 (50) - x = 0.3x 0.72y + 75 - x = 0.3x (0.72)[(x + 300) / 1.62] + 75 = 1.3x (4/9)x + (400/3) + 75 = 1.3x 1.3x - (4/9)x = 625/3 (77/90) x = 625/3 x = 243.51 The total cost of the cokes is $243.51
其他解答:
留言列表
