The cost of 13 school bags is Rs. 1950, find the cost of 4 such bags.

Answer

To find the cost of 4 school bags when the cost of 13 school bags is Rs. 1950, we can use the unitary method. Here's the step-by-step solution:

### Step 1: Find the cost of one school bag
We know that the cost of 13 school bags is Rs. 1950. To find the cost of one school bag, we divide the total cost by the number of bags.

\[ \text{Cost of one school bag} = \frac{\text{Total cost of 13 bags}}{\text{Number of bags}} = \frac{1950}{13} \]

### Step 2: Perform the division
Now, we will perform the division to find the cost of one school bag.

\[ \frac{1950}{13} = 150 \]

So, the cost of one school bag is Rs. 150.

### Step 3: Find the cost of 4 school bags
Now that we know the cost of one school bag, we can find the cost of 4 school bags by multiplying the cost of one bag by 4.

\[ \text{Cost of 4 school bags} = 4 \times \text{Cost of one school bag} = 4 \times 150 \]

### Step 4: Perform the multiplication
Now, we will perform the multiplication to find the total cost of 4 school bags.

\[ 4 \times 150 = 600 \]

### Final Answer
The cost of 4 school bags is Rs. 600.

---