Rs. 16000 was invested for three years, partly in scheme A at the rate of 5% simple interest per annum and partly in scheme B at the rate of 8% simple interest per annum. The total interest received at the end was Rs. 3480. What amount of money was invested in scheme A?
1
Rs. 6500
2
Rs. 5000
3
Rs. 8000
4
Rs. 4000
5
None of these