Given information:
- Cost of goods purchased by A = Rs. 42,500
- Cost of goods sold by B = Rs. 40,000
- Selling price of goods sold by B = Rs. 50,000
- Gross profit percentage on goods sold by B = (50,000 - 40,000)/40,000 * 100 = 25%

To find:
- Cost of goods taken over by A

Solution:
1. Let's first calculate the gross profit earned by B on the goods sold:
- Gross profit = Selling price - Cost price = 50,000 - 40,000 = Rs. 10,000
- Gross profit percentage = Gross profit/Cost price * 100 = 10,000/40,000 * 100 = 25%

2. Now, we can use this gross profit percentage to find the cost of goods taken over by A:
- Let x be the cost of goods taken over by A
- Gross profit on these goods = 25% of x
- Since B and A are selling and buying the goods at the same gross profit percentage, the cost price for A will be:
Selling price for B - Gross profit for B = Cost price for A
50,000 - 25% of x = x
50,000 - 0.25x = x
0.75x = 50,000
x = 50,000/0.75
x = Rs. 66,666.67

3. However, this is the cost of all the remaining goods, including the goods sold by B. To find the cost of goods taken over by A, we need to subtract the cost of goods sold by B:
Cost of goods taken over by A = Total cost - Cost of goods sold by B
Cost of goods taken over by A = Rs. 66,666.67 - Rs. 40,000
Cost of goods taken over by A = Rs. 26,666.67

4. But the question asks for the amount of goods taken over, not the cost. We can find this by dividing the cost by the cost per unit:
Amount of goods taken over by A = Cost of goods taken over by A/Cost per unit
Cost per unit = Cost of goods purchased by A/Number of units purchased by A
Cost per unit = Rs. 42,500/?
We don't know the number of units purchased by A, so we can't find the cost per unit directly. However, we can use the fact that B sold goods at a higher price than their cost to estimate the cost per unit for A:
- B sold goods worth Rs. 50,000, so the number of units sold = 50,000/Cost per unit
- B's cost per unit = Rs. 40,000/Number of units sold
- B's selling price per unit = Rs. 50,000/Number of units sold
- B's gross profit per unit = Rs. 10,000/Number of units sold
- A's cost per unit = B's selling price per unit - B's gross profit per unit
A's cost per unit = (50,000/Number of units sold) - (10,000/Number of units sold)
A's cost per unit = 40,000/Number of units sold

5.