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Q9. A solid metal cylinder has diameter 12 cm and length 25 cm.

Nine holes of diameter 2 cm are drilled through the cylinder, parallel to its axis, as shown in Fig Q9.

Calculate EACH of the following:

(a) the percentage decrease in the volume of the cylinder; (6)

(b) the total surface area of the original cylinder; (4)

(c) the percentage increase in the total surface area after the nine holes have been drilled. (6)