Bhavani invested an amount of Rs. 13900 divided in two different schemes, A and B at the simple interest rate of 14% per annum and 11% per annum respectively if the total amount of simple interest earned in two year be Rs. 3508, what was the amount invested in Scheme B?

Let's say amount in Scheme A = $x$

Then amount in Scheme B = $13900 - x$

Total interest = Interest from A + Interest from B

$3508 = \frac{14 × x × 2}{100} + \frac{11 × (13900-x) × 2}{100}$

$3508 = \frac{28x}{100} + \frac{22(13900-x)}{100}$

$3508 = 0.28x + 3058 - 0.22x$

$3508 = 0.06x + 3058$

$450 = 0.06x$

$x = 7500$ (Amount in Scheme A)

Therefore, Amount in Scheme B = $13900 - 7500 = 6400$