Find the cost of 3/5 of cloth of one metre cloth cost rs 871/2

Cost of 1 metre of cloth = Rs $87\frac{1}{2}$

$$87\frac{1}{2} = \frac{(87 \times 2) + 1}{2} = \frac{174 + 1}{2} = \frac{175}{2}$$

So, the cost of 1 metre of cloth is Rs $\frac{175}{2}$.

To find the cost, multiply the length of cloth by the cost per metre.

$$\text{Cost} = \frac{3}{5} \times \text{Cost of 1 metre}$$ $$\text{Cost} = \frac{3}{5} \times \frac{175}{2}$$

$$\text{Cost} = \frac{3 \times 175}{5 \times 2}$$ $$\text{Cost} = \frac{525}{10}$$

$$\text{Cost} = 52.5$$

or

$$\text{Cost} = 52\frac{1}{2}$$

The cost of $\frac{3}{5}$ m of cloth is Rs 52.50 or Rs $52\frac{1}{2}$.