Question

Find the cost of painting a wall of length 80 m and breadth 15m at the rate of Rs 4 per square meter.​

Answer 1

$\huge{ \underbrace{ \text{Question}}}$

Find the cost of painting a wall of length 80m and breadth 15m at the rate of Rs 4 per square meter.

$\huge{ \text{ \underline{Given}}}$

• Length of the wall is 80m
• Breadth of the wall is 15m
• Cost of painting is at the rate of Rs.4 per square meter.

$\huge{ \underline{ \text{To \: find}}}$

• Total cost of the painting of the wall.

$\huge{ \underline{ \underline{ \text{❣Solution}}}}$

First, we have to know that,

$\large{ \boxed{ \sf{ \blue{Area \: of \: a \: rectangle = (l \times b)square \: units}}}}$

Hence,

$\sf{Area \: of \: the \: wall = 80m \times 15m}$

$\sf{ \therefore{ Area \: of \: the \: wall = \orange{1200sq.m.}}}$

Now,

$\sf{Cost \: of \: paintings \: in \: 1sq.m. = Rs.4}$

$\sf{Cost \: of \: paintings \: in \: 1200sq.m. = Rs.(4 \times 1200)}$

$\sf{ \underline{ \green{ \therefore{Total \: cost \: of \: paintings = Rs.4800}}}}$

More Identities:-

$\sf{ \bold{Perimeter \: of \: a \: rectangle}} = 2(l + b)$

$\sf{ \bold{Area \: of \: a \: square}} = {a}^{2}$

$\sf{ \bold{Perimeter \: of \: a \: square}} = 4a$

❖Hope this helps you!!