The length and breadth of a cuboid is increased by 20% and 25%, respectively, while its height is reduced by 30%. What must be the total percentage increase/decrease in the volume of the cuboid?

Increase by 5%

                                  Before        After

Length increased 20% =    5          6

Breadth increased 25% =    4          5

Height reduced 30%  =      10        7

                               ---------------------

Volume                        200            210

Volume increased% =  \(\frac{10}{200}\) × 100 = 5%