3 cubes of edges 10 cm each are placed side by side nd stuck 2gether. if the outer surface alone is painted @2 p / cm2. Find the cost of painting.

Length of the resulting cuboid, l = (10 + 10 + 10) = 30 cm

Breadth of the resulting cuboid, b = 10 cm

Height of the resulting cuboid = 10 cm

S.A of the resulting cuboid = 2(lb + bh + hl) = 2(300 + 100 + 300) = 2(700) = 1400 cm²

Cost of painting of 1 cm² = 2 paisa

Cost of painting of 1400 cm² = 1400 × 2 = 2800 paisa = Rs.28