maths英文題的百分數－ccf83dy60d的部落格

標題:

maths英文題的百分數

發問:

1. There are 800 students in a school, 45% of them are boys. Find (a) the number of boys; and (b) the number of girls.2. For a product, its marled price = $50, cost price = $40 and selling price = $36. (a) Find the discount. (b) Is there a gain or loss ? Find the fain / loss ? (c) What is... 顯示更多 1. There are 800 students in a school, 45% of them are boys. Find (a) the number of boys; and (b) the number of girls. 2. For a product, its marled price = $50, cost price = $40 and selling price = $36. (a) Find the discount. (b) Is there a gain or loss ? Find the fain / loss ? (c) What is the profit / loss percentage ? (d) What percentage is the price marked up ? 呢幾條題來自Train Up MATHEMATICS 1 (S.1-S.2)

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最佳解答:

Answers shown below: Question 1: (a) the number of boys = 800 X 45% =360 (b) the number of girls = 800 - 360 = 440 Question 2: (a) discount = marked price - selling price = $50 - $36 = $14 (b) There is a loss. The loss = cost price - selling price =$40 -$36 =$4 (c) the loss percentage = 4/40 X 100% =10% (d) the percentage of the price marked up = ($50 - $40) / $40 X 100% = 25%

其他解答:

1. (a) Number of boys = 800 * 45% = 360 (b) Number of girls = 800 – 360 = 440 2. (a) Marked price = $50, selling price = $36, discount = $50 - $36 = $14. Discount rate = $14 / $50 * 100% = 28% (b) Cost = $40, selling price = $36, loss = $40 - $36 = $4. (c) Loss percentage = $4 / $40 * 100% = 10% (d) Marked price = $50, cost = $40, mark up = $50 - $40 = $10. Percentage of price marked up = $10 / $40 * 100% = 25%