Shashi had a certain amount of money. He invested `2/3` of the total money in scheme `A` for 6 years and rest of the money he invested in scheme `B` for 2 years. scheme `A` offers simple interest at a rate of 12% p.a. and scheme `B` offers compound interest (compounded annually) at a rate of 10% p.a. if the total interest obtained from both the schemes is Rs 2,750, what was the total amount invested by him in scheme `A` and scheme `B` together? (Approximate value) (a) Rs 4500 (b) Rs 4200 (c) Rs 4050 (d) Rs 5000