The length of outer boundary of the park = (200 + 300 + 80 + 300 + 200 + 260) m
= 1340 m
∴ Cost of fencing the park at the rate of Rs. 20 per metre = Rs. (20 × 1340) = Rs. 26800
Area of the flower bed = (100 × 80) m2 = 8000 m2
Now, the cost of manuring the flower bed at the rate of Rs. 50 per square metre
= Rs. (50 × 8000)
= Rs. 400000