A tank open at the top is made of iron sheet 4m wide. If the dimensions of the tank are `12 mxx8mxx 6m ,` find the cost of iron sheet at Rs. 17.50 per metre.

Explanation

To solve the problem step by step, we will calculate the surface area of the tank, determine the amount of iron sheet required, and finally calculate the cost of the iron sheet.

### Step-by-Step Solution:

1. **Identify the Dimensions of the Tank:**
- Length (l) = 12 m
- Width (b) = 8 m
- Height (h) = 6 m
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