第 1 題
1 分A pair of shoes is sold for \( \$450 \) at a profit of \( 25\% \). Find the cost price of the shoes.
Key Stage 3 (KS3) · Mathematics
Percentage Change and Simple Interest：練習題
2 條多項選擇題即時批改，另有 4 條文字題附完整解題步驟，全部圍繞「Percentage Change and Simple Interest」。
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第 2 題
1 分The number of members in a sports club increased from 80 to 116. Find the percentage increase.
第 3 題
2 分The population of a small town decreased from \( 2500 \) to \( 2300 \). Find the percentage decrease in the population.
先自己寫一次答案，再對照解題步驟。
第 4 題
4 分A salary of \( \$20,000 \) is increased by \( 10\% \) in the first year and then decreased by \( 10\% \) in the second year. What is the final salary?
先自己寫一次答案，再對照解題步驟。
第 5 題
3 分A shop sells a toy for \( \$120 \) after a \( 20\% \) discount. What was the original price of the toy?
先自己寫一次答案，再對照解題步驟。
第 6 題
4 分A worker's monthly salary was increased by \(10\%\) to \$19,800.
(a) Find the worker's original salary.
(b) If the original salary is now decreased by \(10\%\) instead of increased, what would the new salary be?
先自己寫一次答案，再對照解題步驟。
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