A lends Rs. 4000 to B and a certain sum to C at the same time at 7% per annum simple interest. If after 5 years, A receives Rs. 3500 as interest from B and C. What is the difference of sums given to B and C by A?
1
Rs. 1900
2
Rs. 1750
3
Rs. 2000
4
Rs. 1850