問 1
1 点A company had \( 120 \) employees last year. This year, the number of employees decreased by \( 15\% \). How many employees does the company have now?
Junior Secondary · Mathematics
Use of Percentage：練習問題
その場で採点される選択問題 5 問と、解説つきの記述問題 3 問。すべて「Use of Percentage」からの出題です。
8 問18 点無料・登録不要
問 2
1 点A company's annual revenue was \( \$800,000 \) in 2021. In 2022, the revenue increased by \( 15\% \). However, in 2023, the revenue decreased by \( 10\% \) compared to 2022. What was the company's revenue in 2023?
問 3
1 点Mr. Chan deposits a sum of money into a bank at an interest rate of \(4\%\) per annum, compounded half-yearly. If the total interest earned after one year is \(\$808\), find the principal amount deposited.
問 4
1 点If the value of a machine depreciates by \( 12\% \) each year, what is the value of a machine originally worth \( \$50,000 \) after one year?
問 5
1 点Mr. Chan deposits \( \$20,000 \) into a bank account that pays a simple interest rate of \( 4\% \) per annum. How much interest will he earn after 3 years?
問 6
5 点A store owner marks up an item by \( 60\% \) above the cost price. During a clearance sale, he offers a discount of \( 40\% \) on the marked price. Determine the overall percentage profit or loss based on the cost price.
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 7
5 点The population of a city grew by \( 2\% \) in 2022 and then by \( 5\% \) in 2023. If the population was 420,000 at the end of 2023, find the population at the beginning of 2022, correct to the nearest hundred.
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 8
3 点A technician's monthly salary was increased by \( 15\% \) to \( \$27,600 \). Find his original salary before the increase.
まず自分で答えを書いてから、解説と照らし合わせましょう。
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