A) 32
B) 64
C) 25
D) 16
Correct Answer: B
Solution :
If the length and breadth of a rectangle are changed by x % And y % respectively, the effective change in area \[=\left( x+y+\frac{xy}{100} \right)%\] Here, \[x=-\,40\] \[y=-\,40\] \[\therefore \] Percentage decrease \[=\left( -\,40-40+\frac{40\times 40}{100} \right)%\] \[=(-\,80+16)%=64%\] Negative sign shows decrease.You need to login to perform this action.
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