A person lent a part of Rs.7000 at 6% p.a. and the remaining at 4% per annum. The interest he received from both the parts in 5 years was Rs.1600. The sum lent at 6% p.a. is ______.
Rs.2000
Overall rate on interest=1600×1005×7000=327%
Ratio of two amounts=2:5∴Amount lent at 6%=70007×2=Rs. 2000