The height of a triangle is decreased by 25% and its base increased by 50%. Its area will Select the correct option.
A) decrease by 12.5% B) increase by 12.5% C) decrease by 25% D) Increase by 25% E) None of these
Explanation :   Let the initial height be 100 and the base be 200 units.   ∴ Area = 1/2 x 100 x 200 = 1000sq units   Now, height = 75 units and base = 300 units   ∴ New area = 1/2 x 75 x 300 = 11250   ∴ Area is increased by (11250 - 10000)/10000 x 10   = 12.5%   Answer : Option increase by 12.5%
<result>B</result>
The height of a triangle is decreased by 25% and its base increased by 50%. Its area will