The simple interest on a certain sum of money invested at a certain rate for 2 years amounts to Rs. 1200. The compound interest on the same sum of money invested at the same rate of interest for 2 years amounts to Rs. 1290. What was the principal?
‘Mentor India’ Compaign is an initiative to engage leaders who can guide and mentor students at ‘Atal Tinkering Labs’ across the country. Who launched‘Mentor India’ Campaign?