Question

Find find the cost of painting the all around outer surface of a box with a lid 16 cm long 14 cm wide and 30 cm high at 15% per 20 cm square

Answer 1

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Answer:

T. S. A of Cuboidal box = 2(lb+bh+hl)

$\begin{lgathered}= 2(60 \times 40 + 40 \times 30 + 30 \times 60) \\ \\ = 2(2400 + 1200 + 1800) \\ \\ = 2(5400) \\ \\ = 10800c {m}^{2}\end{lgathered}$

Now finding the cost,

$\begin{lgathered}20c {m}^{2} = 50 \: paisa \\ \\ = 1c {m}^{2} = \frac{50}{20} \: paisa \\ \\ = 10800c {m}^{2} = 27000 \: paisa \\ \\ = 270 \: rupees\end{lgathered}$