Question

In a square park of size 120m×120m, a circular lawn of radius 21m is provided at its centre. find the cost of (i) raising the lawn at the rate of rupee 5per sqm (ii) cementing the remaining portion of the park at the rate of rupee 22 per square metre

Answer 1

Answer:

i) Rs 6930

ii) Rs 286308

Step-by-step explanation:

Area of square park = 120 * 120 = 14400 m^2

Area of Circular Lawn = pie * (Radius)^2

= (22/7) * (21)^2

= 22 * 21 * 3

= 1386 m^2

i) cost of raising lawn = 5 * 1386 = Rs 6930

ii) Cost of cementing remaining portion = 22 * ( Remaining Area)

remaining area = Square park area - circular lawn area

= 14400 - 1386

= 13014 m^2

Cost of cementing remaining portion = 22 *  13014 = Rs 286308