Mr. Kaushik invested an amount of Rs. 13,900 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 2 years be Rs. 3508, what was the amount invested in Scheme B?

Rs. 6400

Rs. 6500

Rs. 7200

Rs. 7500

Explanation:

Let the sum invested in Scheme A be Rs. x and that in Scheme B be Rs. (13900-x).

Then,

=> x $\times$ 14 $\times$ 2/100 + (13900-x) $\times$ 11 $\times$ 2)/100 = 3508

=> 28x - 22x = 350800 - (13900 x 22)

=> 6x = 45000

=> x = 7500.

So, sum invested in Scheme B = Rs. (13900-7500) = Rs. 6400.