Math topic中文

Reverse percentages

reverse percentages

Practice questions

  1. 1On 1st January 2018, Mrs Yeo invests $15000 in an account which pays at a rate of compound interest of RR% per year. O…
  2. 2某商品提价25%后，欲恢复原价，则应降价（ ） A. 40% B. 25% C. 20% D. 15%
  3. 3The marked price of a mobile phone is $1288. After selling the mobile phone at 15% discount, the shop owner still makes…
  4. 4Elva invested a sum of money in an account paying compound interest at 4% per year. After 3 years, there was $89 989.12…
  5. 5一种杂志，批发商按定价的七折批发给书摊，摊主将定价减少一成卖给读者，如果这种书每本卖6.3元，每本杂志的批发价是多少元？
  6. 6某商店在某一时间以毎件100元的价格卖出兩件衣服，其中一件盈利25%，另一件亏损20%，求该商店卖出这两件衣服的盈亏情况．
  7. 7On 6 June 2020, Elijah invested some money in a bank which pays a simple interest at a rate of 3.5% per annum. He receiv…
  8. 8John owns a cleaning company that cleans office blocks. The number of employees in his company and their salaries in 202…
  9. 9The table below shows part of Ahmad's personal income tax bill. Calculate the values of p and q. Answer p = ... q = ...…
  10. 10Mr Smith plans to invest his money in unit trust with a bank. His target is to earn an interest of $10,000 after 5 year…
  11. 11某人八折优惠价买一套省了2525元，那么买这套服装实际花了多少钱()() A. 31.2531.25元 B. 6060元 C. 125125元 D. 100100元
  12. 12Javelle went to a café and ordered a slice of cake and a cup of tea. Unfortunately, the receipt was stained and parts of…
  13. 13根据半岛电视台报道，阿富汗战争共导致阿富汗全国22.1%的人口受伤，12.92%的人口死亡．据统计，阿富汗战后的总人口是2212万人．那么在这场战争中，共导致阿富汗百分之 的人口伤亡．阿富汗在战前的人口总数是 万人．（保留4为有效数字）
  14. 14As of 2023, the population of Singapore is approximately 5.64 million and the population of Malaysia is approximately 33…
  15. 15超市运来黄瓜300300千克，比运来的西红柿少25％25％，运来西红柿多少千克？
  16. 16第五次全国人口普查统计数据（2001年3月28日新华社公布） 截至2000年11月1日0时，全国每10万人中具有大学文化程度的人数约为3 611人，比1990年7月1日0时增长93.64%了．问1990年6月底每10万人中约有 人具有大学文…
  17. 17Rebecca always travels by taxi to work. To get a taxi, she has two options. She can either flag down a taxi at the roads…
  18. 18某商店有两个进价不同的计算器都卖64元，一个贏利60%，另一个亏本20%，在这次买卖中，你觉得这家商店 元（填赚多少或亏多少）．
  19. 19The box-and-whisker plots show the distribution of the masses (in grams) of eggs sold in Shop A and Shop B. There are 25…
  20. 20Sophie earns a monthly salary of $6875. She gives 15% of this amount to her parents. She puts 35% of the remainder into…
  21. 2113 Catherine ordered a basket of fruits containing apples, oranges and pears only. 516\frac{5}{16} of the fruits are appl…
  22. 22Jenny earns 5625eachmonth.Shepays85625 each month. She pays 8% of this amount into her pension. She pays 5% of the remainder into a savings account. Calculate the amount she has left after paying into her pension and her savings account. Answer …
  23. 23Bernice invests $700 at a rate of r % per year compound interest, compounded every 3 months. At the end of 5 years the…
  24. 24In 2023, the population in Singapore was 5 920 000, correct to the nearest ten thousand. The population increased by 4%…
  25. 25甲书架上有书180180本，是甲、乙两个书架上书的总数的60％60％，甲、乙两个书架共有书多少本？
  26. 26Matthew invests $20 000 into a fixed deposit at r%r\% per month, compounded monthly. After 24 months he will be able to…
  27. 27A shopkeeper bought a pair of shorts for 24.Hemadeapercentageprofitof4524. He made a percentage profit of 45% despite selling it at a discount of 20% off the listed price. Calculate the listed price for this pair of shorts. Answer …
  28. 28李大爷的果园，今年收桃子3636吨，比去年增产二成，去年收桃子___吨．
  29. 29修建一幢大楼，用去1128万元，比计划节约6%，原计划投资多少万元？
  30. 30比5050千米多20％20％是___千米，1212吨比___吨少20％.20％.
  31. 31闽西八大干是福建客家菜系代表之一。某超市新进长汀豆腐干 80 千克。 （ 1 ）若求新进的明溪肉脯干的质量时列成的算式是“ 80 ÷（ 1 ＋ 25% ）”，则需要补充什么条件？ （ 2 ）若新进的上杭萝卜干的质量比长汀豆腐干少 20% ，…
  32. 32小玲这个月当家，这个月支出的水费是240元，比上月节约了25%，上月的水费是多少元？
  33. 33The amount of plastic waste in Singapore was 900 000 tonnes in 2019. This is an increase of 10% from 2018. Find the amou…
  34. 34Rayden invested 20000atarateof0.320 000 at a rate of 0.3% per month compound interest. Find the value of his investment at the end of 2 years. Answer …
  35. 35一台笔记本电脑，每台卖5795元，比原来每台优惠5%．优惠了多少钱？
  36. 36Mrs Tan planned to earn an interest of $1000 at the end of 5 years by investing her money in a bank. The rate of compou…
  37. 37据统计，2012年某城市的绿化面积为56.4平方千米，剩下的面积占城市总面积的53%，这座城市的总面积大约是多少平方千米？
  38. 38一桶油倒出85%，桶内还剩下24千克油．桶内原有油多少千克？
  39. 39Wayne inherited a sum of money from his parents. He decided to invest 60% of the money and shares 34\frac{3}{4} of the r…
  40. 40The selling price of a laptop is $2675. A student can buy this laptop at a discounted price of $2140. Calculate the pe…