Hello Prasad !
Formula for Volume of cuboid is , (length × breadth × height) cubic units.
So , if length is increased by 20% which means new length is 1.2 time of old length , similarly , new breadth will become 1.1 time more and height will become 0.95 times of old height , as it decreased.
So now , new volume will become , 1.2 * length × 1.1*breadth × 0.95*height ,
1.254 * length × breadth × height ,
Which means it get increased by 25.4 %
Hope it helps !
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