length of a rectangle is 30m and breadth is 20m what will be the increase in its area if length isincreased by 10m and breadth is doubled
Answers
Answered by
4
Here you go... Hope it helps.
Attachments:
Answered by
6
1method
Let length be 10
And breadth be 10
Area 100
Now length is increased by 20%
New length 12
And breadth is decreased by 10%
New breadth is 9
New area is 12*9=108
Change in area 108-100= 8
So overall area increases by 8%
____________________________________
2nd method
Use this formula (x+y+xy/100)
Where x,y are percentage change
Use positive for increment
Use negative for decrement.
And observe overall result
In above question
x=20, y= -10
So overall change
(20 -10 +(20)*(-10)/100)
(10- 200/100)
(10- 2)
8
Result is +ve so overall area increases by 8%
HOPE IT IS CORRECT....
THANK YOU......(≧∇≦)
Let length be 10
And breadth be 10
Area 100
Now length is increased by 20%
New length 12
And breadth is decreased by 10%
New breadth is 9
New area is 12*9=108
Change in area 108-100= 8
So overall area increases by 8%
____________________________________
2nd method
Use this formula (x+y+xy/100)
Where x,y are percentage change
Use positive for increment
Use negative for decrement.
And observe overall result
In above question
x=20, y= -10
So overall change
(20 -10 +(20)*(-10)/100)
(10- 200/100)
(10- 2)
8
Result is +ve so overall area increases by 8%
HOPE IT IS CORRECT....
THANK YOU......(≧∇≦)
Similar questions