Susan invested certain amount of money in two schemes A and B, which offer interest at the rate of 8 % per annum and 9 % per annum, respectively. She received Rs. 1860 as annual interest. However, had she interchanged the amount of investments in the two schemes, she would have received Rs. 20 more as annual interest. How much money did she invest in each scheme?
a. Rs. 13000 in scheme A, Rs. 12000 in scheme B
b. Rs. 11000 in scheme A, Rs. 10000 in scheme B
c. Rs. 12000 in scheme A, Rs. 10000 in scheme B
d. Rs. 10000 in scheme A, Rs. 13000 in scheme B
