Profit Loss

Let the cost price of the total goods be and the marked price be .
Step 1: The selling price of of the goods at marked price is: The cost price for these goods is , and the profit for this part is: Since the profit margin is 20\%, we have:
Step 2: The remaining of the goods is sold at 20\% discount, so the selling price for these goods is:
Step 3: The total selling price is: The total cost price is , and we can now find the total profit:
Step 4: Solve for the total gain percentage: Thus, the gain percent in the whole transaction is 10.4%.

Step 1: Let the original cost price of the table be .
Step 2: ‘A’ sold the table to ‘B’ at 15\% profit, so the selling price from A to B is: Step 3: ‘B’ sold the table back to ‘A’ at 20\% profit, so the selling price from B to A is:
Step 4: The profit gained by ‘A’ is Rs. 69, so:
Step 5: Solve for : Thus, the original cost price of the table is Rs. 300.