A bus stop is bar

Radius (r) = = 20 cm

= 0.2 m

Height (h) = 1 m

Slant height (l) =

=

= 1.02 m

Curved Surface Area =

= (3.14  × 0.2×1.02) m²

= 0.64056 m²

CSA (50 cones) = 0.64056 * 50

= 32.028 m²

Cost of painting 1 m² area = Rs 12

Cost of painting 32.028 m² area = Rs (32.028 × 12)

= Rs 384.336

= Rs 384.34 (approximately)

Therefore, it will cost Rs 384.34 in painting 50 such hollow cones.