# Question number 10

The length of the cardboard is 24cm + 4cm + 4cm = 32cm

The width of the cardboard is 20cm + 4cm + 4cm = 28cm

a) Area of margin = area of cardboard – area of poster

=(32cm × 28cm)-(24cm × 20cm)

=896 cm² – 480 cm²

=416 cm²

b) Here, area of cardboard = 896 cm²

Given, cost of the cardboard used at the rate of Rs 0.86 per cm²

Therefore, total cost = 896 x 0.86 = 770.56 Rs