= 3. 14x 0. 1x 0. 1

=0.03 14

3. 14x 20÷ 100 x40÷ 100 x2

=3. 14x0.2x0.4x2

=0.25 12

(0.03 14x 2+0.25 12)x 100

=0.3 14x 100

=3 1.4

Made 100 pieces

Metal barrel

To 3 1.4 square meters of iron sheet.