Sure, here’s a simpler explanation:
Sara bought 5kg of potatoes from a shopkeeper for Rs. 390. The shopkeeper made a profit of 4% on the potatoes. Before that, Sara bought the same potatoes from a wholesaler who also made a profit of 4%. We need to find out how much the wholesaler charged Sara for the potatoes.
Let’s assume that the wholesaler charged x rupees for 1kg of potatoes. So, the cost price of 5kg of potatoes for Sara would be 5x.
The wholesaler made a profit of 4%, which means he sold the potatoes to Sara for 1.04x rupees per kg. So, the cost price of 5kg of potatoes for the wholesaler would be 5 * 1.04x = 5.2x.
Now, the shopkeeper also made a profit of 4% on the potatoes. So, he sold the potatoes to Sara for 1.04 times the cost price he paid to the wholesaler. That means, the shopkeeper sold the potatoes to Sara for 1.04 * 5.2x = 5.408x rupees.
We know that Sara paid Rs. 390 for 5kg of potatoes to the shopkeeper. So, we can set up the equation:
5.408x = 390
Solving for x, we get:
x = 75
Therefore, the wholesaler charged Sara Rs. 75 per kg for the potatoes.