Question

The volume of a cylinder is 47432 CM square find the cost of making its total surface with steel at the rate rupee 385 per metre square of its height is 77 CM

Answer 1

Given:

The volume of a cylinder is 47432 CM square

To Find:

Find the cost of making its total surface with steel at the rate rupee 385 per metre square of its height is 77 CM

Solution:

Volume of cylinder = $\pi r^2 h$

Height of cylinder = 77 cm

Volume of cylinder =$\frac{22}{7} \times r^2 \times 77$

We are given that The volume of a cylinder is 47432 CM square

So,$\frac{22}{7} \times r^2 \times 77 =47432\\r^2=\frac{47432 \times 7}{22 \times 77}\\r=\sqrt{\frac{47432 \times 7}{22 \times 77}}\\r=14$

Total surface area of cylinder= $2 \pi rh + 2 \pi r^2 = 2 \times \frac{22}{7} \times 14 \times 77 + 2 \times \frac{22}{7} \times 14^2=8008 cm^2$

$10000 cm^2=1 m^2 \\8008 cm^2 = \frac{8008}{10000}=0.8008 m^2$

Cost of 1 sq.m. = Rs.385

Cost of 0.8008 sq.m. =$385 \times 0.8008=308.308$

Hence the cost of making its total surface with steel is Rs.308.308

Answer 2

Answer:

rupees 308.308

Step-by-step explanation:

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