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?
A)20
B)21
C)12
D)11

Question

Quizplus · Accepted Answer

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.

If the Length and Width of a Rectangular Garden Plot