Explanation:

Here Radius of Cone = 3 cm and Height is 7 cm

Volume of cone = 1/3 (πr²h)                          

Volume of cuboid block = L × B × H

                                        = (10 × 5 × 2) cm³

                                        = 100 cm³

Wood Wasted = Volume of Cuboid Block - Volume of Cone

                       = 100 cm³ - 66 cm³  = 34 cm³

Percentage of wood wasted = (wasted wood / volume of cuboid block) ×100

                                              = (34/100)×100  = 34%