第 1 题
1 分A student scored \( 18 \) out of \( 25 \) in a mathematics test. What is the score expressed as a percentage?
GCE O-Level · Mathematics (4052)
Percentage：练习题
4 道选择题即时批改，另有 3 道文字题附完整解题步骤，全部围绕「Percentage」。
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第 2 题
1 分A rectangular field has its length and width increased by \( 20\% \) and \( 10\% \) respectively. Calculate the percentage increase in the area of the field.
第 3 题
1 分A sum of money was invested in a bank at a compound interest rate of \( r\% \) per annum, compounded yearly. If the principal amount doubled after 10 years, which of the following expressions represents \( r \)?
第 4 题
1 分The price of a laptop after a \( 15\% \) discount is \( \$1,020 \). Calculate the original price of the laptop before the discount.
第 5 题
2 分Express \( 45 \) minutes as a percentage of \( 2.5 \) hours.
先自己写一遍答案，再对照解题步骤。
第 6 题
3 分A company's annual profit increased by 15% in 2022 to reach \$460,000. In 2023, the profit then decreased by 10% from the 2022 level. Calculate the total profit the company made in the year 2021.
先自己写一遍答案，再对照解题步骤。
第 7 题
5 分A rectangular plot of land has its length increased by \( 25\% \) and its width decreased by \( 20\% \). Calculate the percentage change in the total area of the land.
先自己写一遍答案，再对照解题步骤。
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