The ratio between the marked price of a T-shirt and a Jeans is 3: 5. Gopal, a whole seller allowed x% discount on the T-shirt and (x + 25) % discount on the Jeans, due to which the selling price of both clothes becomes equal. If he earned a profit of 25% on selling a T-shirt, and a profit of 20% on selling Jeans, and the profit earned on a T-shirt is Rs. 120 more than that of the Jeans, then find the difference between the cost price of the T-shirt and the Jeans?