Case StudyIn a residential society comprising of 100 houses, there were 60 children between the ages of $10-15$ years. They were inspired by their teachers to start composting to ensure that biodegradable waste is recycled. For this purpose, instead of each child doing it for only his/her house, children convinced the Residents welfare association to do it as a society initiative. For this they identified a square area in the local park. Local authorities charged amount of $\text{₹} 50$ per square metre for space so that there is no misuse of the space and Resident welfare association takes it seriously. Association hired a labourer for digging out $250 \text{m}^3$ and he charged $\text{₹} 400 \text{X}$ (depth) $)^2$. Association will like to have minimum cost.