Rakesh invested Rs. 12000 in two different schemes. First at 10% per annum, rest at 20% per annum and thus in 4 years the total interest from both the amounts collected was Rs. 6720. What was the amount lent out @ 20% per annum?
1
Rs. 4600
2
Rs. 4400
3
Rs. 4800
4
Rs. 5000
5
None of these