Question

The length of a rectangular field is increased by 30% and breadth is decreased by 30%. what is the percent increase or decrease in its area?
A) 9% increase
B) 21% decrease
C) 21% increase
D) 9% decrease ​

Answer 1

Answer:

21 decrease because it's increase by 30

Answer 2

Step-by-step explanation:

let the lenght is "x" and breadth is "y"

area is "xy"

length is increased by 30℅

so new length become =1.3x

breadth is decreased by 30%

so new breadth become =0.7y

new area become =1.3x*0.7y

=0.91xy

so differentiation between old and new area is

=xy-.91xy=0.9xy

so the new length is decreased by 9%.