Practice Quiz

SAT Math Practice Exam

Category - Mathematics - Hard

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If the length and width of a rectangular garden plot were each increased by 10 percent, what would be the percent increase in the area of the plot?
  1. 20
  2. 21
  3. 12
  4. 11
Explanation
Answer B: If length l is increased by 10%, it becomes 1.1 l. Similarly width becomes 1.1 w. Area = length X width = 1.1 l X 1.1 w = 1.21lw. Thus, the area lw increases to 1.21lw. Hence the increase is 21%.

Key takeaway: While multiplying decimal number, be careful in placing decimal at proper place.
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