Answer :

**Given:****Height (h) cylindrical pillar = 3.5 m****Radius (r) of the circular end of pillar = = 25 cm = 0.25 m**

CSA of pillar = 2πrh

= 2 x x 0.25 x 3.5 m^{2}

= (44 x 0.125) m^{2}

= 5.5 m^{2}

Cost of painting 1 m^{2} area = Rs 12.50

Cost of painting 5.5 m^{2} area = Rs (5.5 × 12.50)

= Rs 68.75

Therefore, the cost of painting the CSA of the pillar is Rs 68.75

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