第 1 题
1 分A library has a total of \( 1,200 \) books. If \( 45\% \) of the books are classified as fiction, how many fiction books are in the library?
SAT (Scholastic Assessment Test) · Math
Percentages：练习题
5 道选择题即时批改，另有 1 道文字题附完整解题步骤，全部围绕「Percentages」。
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第 2 题
1 分If \( 40\% \) of a number \( n \) is \( 24 \), what is \( 30\% \) of \( n \)?
第 3 题
1 分The value of a certain stock increased by \( 20\% \) in the first year and then decreased by \( 15\% \) in the second year. What was the total percentage change in the stock's value over the two-year period?
第 4 题
1 分If \( 15\% \) of \( 400 \) is equal to \( 20\% \) of a number \( x \), what is the value of \( x \)?
第 5 题
1 分The price of a computer was decreased by \( 20\% \) of its original price. One month later, the new price was increased by \( 20\% \). What is the final price of the computer relative to the original price?
第 6 题
2 分On a test with \( 60 \) questions, Sarah answered \( 85\% \) of the questions correctly. How many questions did she answer correctly?
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