A shopkeeper sells a pair of sunglasses at a profit of 25%. If he had bought it at 25% less and sold it for Tk. 10 less, he would have gained 40%. Determine the cost price of the pair of sunglasses.

• ক Tk. 75
• খ Tk. 25
• গ Tk. 30
• ঘ Tk. 50 ✅ সঠিক উত্তর