Question

find the the cost of carpeting the room 13 m long and 9 m broad at the rate of rupees 12.40 per square meter

Answer 1

$$\begin{gathered} \mathrm{Length}\mathrm{of}\mathrm{the}\mathrm{room}=\mathrm{l}=13\mathrm{m} \\ \mathrm{Breadth}\mathrm{of}\mathrm{the}\mathrm{room}=\mathrm{b}=9\mathrm{m} \\ \mathrm{Area}\mathrm{of}\mathrm{the}\mathrm{floor}=\mathrm{lb}=13\times 9=117{\mathrm{m}}^2 \\ \mathrm{Cost}\mathrm{of}\mathrm{carpetting}1{\mathrm{m}}^2\mathrm{area}=\mathrm{Rs}12.40 \\ \mathrm{So},\mathrm{cost}\mathrm{of}\mathrm{carpetting}117{\mathrm{m}}^2\mathrm{area}=\mathrm{Rs}\left(117\times 12.40\right)=\mathrm{Rs}1450.80 \end{gathered}$$