The height of a triangle is decreased by 5% and its base increased by 10%. Its area will	Choose one:
A) decrease by 12.5%  B) increase by 12.5%  C) increase by 4.5%  D) Increase by 25%  E) None of these
Explanation :   Let the initial height be 100 and the base be 200 units.   âˆ´ Area = 1/2 x 100 x 200 = 10000sq units   Now, height = 95 units and base = 220 units   âˆ´ New area = 1/2 x 95 x 220= 10450   âˆ´ Area is increased by (10450 - 10000)/10000 x 10   = 4.5%   Answer : Option increase by 4.5%
<result>C</result>
The height of a triangle is decreased by 5% and its base increased by 10%. Its area will