Hello,
You can use this formula - [ x + y + (xy/100)]
Let X = Percentage Increase or Decrease in Length
Y = Percentage Increase or Decrease in Breadth
Use + plus or - minus sign according to increase or decrease.
So, according to question - there is 20% increase in length and 10% increase in breadth. Therefore X = +20, Y = +10
Now, put the values in the formula [x + y + (xy/100)]
= [ +20 + 10 + (+200/100)]
= [ 30 + 2 ] = 32%
Overall Increase in area of rectangle is 32%
Hope this was helpful.
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