If 40 articles cost Rs. 180, the cost of 18 articles is:

Options

A. Rs. 18
B. Rs. 36
C. Rs. 81
D. Rs. 0.5

Answer

To find the cost of 18 articles when 40 articles cost Rs. 180, we can follow these steps:

### Step-by-Step Solution:

1. **Determine the cost of one article**:
We know that 40 articles cost Rs. 180. To find the cost of one article, we divide the total cost by the number of articles.
\[ \text{Cost of 1 article} = \frac{180}{40} \]

2. **Calculate the cost of one article**:
\[ \text{Cost of 1 article} = \frac{180}{40} = 4.5 \text{ Rs.} \]

3. **Find the cost of 18 articles**:
Now that we know the cost of one article, we can find the cost of 18 articles by multiplying the cost of one article by 18.
\[ \text{Cost of 18 articles} = 18 \times \text{Cost of 1 article} = 18 \times 4.5 \]

4. **Calculate the total cost for 18 articles**:
\[ \text{Cost of 18 articles} = 18 \times 4.5 = 81 \text{ Rs.} \]

5. **Conclusion**:
Therefore, the cost of 18 articles is Rs. 81.

### Final Answer:
The cost of 18 articles is Rs. 81.

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