omckyyo的部落格

標題:

數學問題(只需答案)

• iphone.3G
• 全港最平韓劇在哪-
• 稅務局的工作
• F.4 Exponential and log (M1)
• 請告訴我海賊王299集之後的之後的名稱 !!!急!!~_13
• 香港市電的電壓是多少伏特--
• ”15點”豐原到后里公車時刻表((急))
• 請問秦始皇打過幾多場杖_5
• 體育項目世界排名
• anna sui 胭脂..

此文章來自奇摩知識+如有不便請留言告知

發問:

1. Mr. Chang bought a flat in 2003 for $3000000. He sold the flat in 2007 for $5400000. Find the percentage gain.2. In the production of a book, the cost of paper is $15, the cost of printing is $10 and the cost of binding is $5. If the cost of paper increases 20%, cost of printing increases 10% and the cost of... 顯示更多 1. Mr. Chang bought a flat in 2003 for $3000000. He sold the flat in 2007 for $5400000. Find the percentage gain. 2. In the production of a book, the cost of paper is $15, the cost of printing is $10 and the cost of binding is $5. If the cost of paper increases 20%, cost of printing increases 10% and the cost of binding increases 10%, then the production cost is increased by 3. The length of a rectangle is increased by 20% and its width is decreased by 20%. Its area 4. Sharon buys an automobile at $116000. If its value depreciates by 15% every year, what is its value 4 years later? (correct to nearest dollars) 5. A bag of marked price $460 is now sold at $322. Find the discount on the marked price. 6. If a book is sold at the price of $150, the profit will be 20%. What will be the profit if the book is sold at the price of $170? 7. In a Mathematic Examination, A got 12.5% more than B, B got 7% less than C. If A got 90 mark, what was the mark of C obtained in the examination? 8. The length and the width of a rectangular leaflet are 25cm and 10cm respectively. If the length is increased by 20% but the perimeter of the leaflet remains unchanged, what is the percentage change in the area of the leaflet? 9. 50 kg of alloy steel contains 80% of iron and 20% of aluminum by weight. How much of aluminum to be melted so that the new alloy contains 32% of aluminum by weight? 10. The population of a city in 2002 was 1200000 and it grows at a steady rate of 5% each year. Find the population in 2007. (correct to the nearest thousand) thank you!!!!

最佳解答:

1. 80% 2. 15% 3. Its area is decreased by 4% 4. $60553 5. 30% off 6. 36% 7. 86 8. decreased by 40% 9. I guess the question should be "How much of iron to be melted so that the new alloy contains 32% of aluminum by weight" 18.75 kg 10. 1532000

其他解答:7638E748CCC65837