The height of a triangle is decreased by 25% and its base increased by 40%. Its area will Choose one:
A) decrease by 12.5%
B) increase by 12.5%
C) decrease by 25%
D) Increase by 25%
E) Increase by 5%
Explanation :   Let the initial height be 100 and the base be 200 units.   âˆ´ Area = 1/2 x 100 x 200 = 1000sq units   Now, height = 75 units and base = 280 units   âˆ´ New area = 1/2 x 75 x 280 = 10500   âˆ´ Area is increased by (10500 - 10000)/10000 x 100   = 5%   Answer : Option Increase by 5%
<result>E</result>
The height of a triangle is decreased by 25% and its base increased by 40%. Its area will