In a rectangular parallelepiped, the sides of the base were increased by 20% and 10%, and the height was decreased

In a rectangular parallelepiped, the sides of the base were increased by 20% and 10%, and the height was decreased by 20%. How much has the volume of the parallelepiped changed?

Let the initial volume of the parallelepiped be x. According to the formula V1 = a * b * h = x. For the modified parallelepiped V2 = 1.2a * 1.1b * 0.8h = 1.056x
V2 – V1 = 1.056x – x = 0.056x
0.056 * 100% = 5.6%
Thus, the volume increased by 5.6%