Answer:
Volume of cube = 0.0008a³ unit³
Explanation:
Let the side length of the cube be a units
Now, The side length of the cube is decreased by 20%
So, New side length of the cube = a - 20% of a
⇒ New side length of the cube = a - 0.20 × a
⇒ New side length of the cube = a - 0.2·a
⇒ New side length of the cube = 0.8·a
Now, volume of the cube is given by the formula : Volume = (Edge)³
⇒ Volume of cube = (0.8a)³
⇒ Volume of cube = 0.0008a³ unit³