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中一數學題目急 最佳40點

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麻煩有式有答案..A few years ago, MR CHAN bought 10kg Tea A for $130 per kg and 2kg Tea B $600 per kg. Now he just sells all of the two types of tea for $400 and $2500 per kg respectively. On the whole, what is the profit percent?A model manufacturer made 4000 model aeroplanes and sold them at a profit of $780. If the... 顯示更多 麻煩有式有答案.. A few years ago, MR CHAN bought 10kg Tea A for $130 per kg and 2kg Tea B $600 per kg. Now he just sells all of the two types of tea for $400 and $2500 per kg respectively. On the whole, what is the profit percent? A model manufacturer made 4000 model aeroplanes and sold them at a profit of $780. If the profit per cent was 30%, find the cost price of each model aeroplane. In a watch shop, all items are sold at a 30% discount and customers paying in cash can enjoy a further 5% discount on the reduced prices. If Cindy pays $1064 in cash to buy a watch, what is the marked price? A computer game marked at $320 is sold at a discount of 40%. If the discount is 64% of the cost price, find the profit or loss per cent. Clement deposits a sum of money in bank for 146 days and the interest rate is 4%p.a. After 146 days, he received the amount of $25400. Find the original sum of money that he dospited. Jacky borrows $40000 from a bank where simple interest is calculated at an interest rate of R% p.a. Find the value of R. The amount is 3 times the original principal after 20 years.

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A few years ago, MR CHAN bought 10kg Tea A for $130 per kg and 2kg Tea B $600 per kg. Now he just sells all of the two types of tea for $400 and $2500 per kg respectively. On the whole, what is the profit percent? Cost price = $(130 x 10 + 600 x 2) = $2500 Selling price = $(400 x 10 + 2500 x 2) = $9000 Profit per cent = [(9000 - 2500)/2500] x 100% = 260% A model manufacturer made 4000 model aeroplanes and sold them at a profit of $780. If the profit per cent was 30%, find the cost price of each model aeroplane. Cost price of each model aeroplane = $780 ÷ 30% ÷ 4000 = $0.65 In a watch shop, all items are sold at a 30% discount and customers paying in cash can enjoy a further 5% discount on the reduced prices. If Cindy pays $1064 in cash to buy a watch, what is the marked price? Marked price = $1064 ÷ (1 - 5%) ÷ (1 - 30%) = $1600 A computer game marked at $320 is sold at a discount of 40%. If the discount is 64% of the cost price, find the profit or loss per cent. Cost price = $320 x 40% ÷ 64% = $200 Selling price = $320 x (1 - 40%) = $192 Loss per cent = [(200 - 192)/200] x 100% = 4% Clement deposits a sum of money in bank for 146 days and the interest rate is 4% p.a. After 146 days, he received the amount of $25400. Find the original sum of money that he deposited. Original sum of money = $25400 ÷ [1 + 4% x (146/365)] = $25000 Jacky borrows $40000 from a bank where simple interest is calculated at an interest rate of R% p.a. Find the value of R. The amount is 3 times the original principal after 20 years. 3P = P x (1 + R% x t) 2P = P x R% x t R% = (3 - 1) ÷ 20 = 10% Hence, R = 10

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A few years ago, MR CHAN bought 10kg Tea A for $130 per kg and 2kg Tea B $600 per kg. Now he just sells all of the two types of tea for $400 and $2500 per kg respectively. On the whole, what is the profit percent? Cost price = $(130 x 10 + 600 x 2) = $2500 Selling price = $(400 x 10 + 2500 x 2) = $9000 Profit per cent = [(9000 - 2500)/2500] x 100% = 260% A model manufacturer made 4000 model aeroplanes and sold them at a profit of $780. If the profit per cent was 30%, find the cost price of each model aeroplane. Cost price of each model aeroplane = $780 ÷ 30% ÷ 4000 = $0.65 In a watch shop, all items are sold at a 30% discount and customers paying in cash can enjoy a further 5% discount on the reduced prices. If Cindy pays $1064 in cash to buy a watch, what is the marked price? Marked price = $1064 ÷ (1 - 5%) ÷ (1 - 30%) = $1600 A computer game marked at $320 is sold at a discount of 40%. If the discount is 64% of the cost price, find the profit or loss per cent. Cost price = $320 x 40% ÷ 64% = $200 Selling price = $320 x (1 - 40%) = $192 Loss per cent = [(200 - 192)/200] x 100% = 4% Clement deposits a sum of money in bank for 146 days and the interest rate is 4% p.a. After 146 days, he received the amount of $25400. Find the original sum of money that he deposited. Original sum of money = $25400 ÷ [1 + 4% x (146/365)] = $25000 Jacky borrows $40000 from a bank where simple interest is calculated at an interest rate of R% p.a. Find the value of R. The amount is 3 times the original principal after 20 years. 3P = P x (1 + R% x t) 2P = P x R% x t R% = (3 - 1) ÷ 20 = 10% Hence, R = 10A9A39959EDCC7BE3