The compound interest on a certain sum for 2 years at 10% per annum is Tk. 525 . The simple interest on the same sum for doubled the time at half the rate percent per annum is-

• ক Tk. 450
• খ Tk. 550
• গ Tk. 480
• ঘ Tk. 500 ✅ সঠিক উত্তর