Shelley decided to invest 11,000 of her retirement fund conservatively. She invested part of this money into one account that pays 5% simple interest and part into another account that pays 2% simple interest. Last year she earned 310 in interest. How much did she invest in each type of account?
(a) 7,000 in the 5% account and 4,000 in the 2% account
(b) 6,000 in the 5% account and 5,000 in the 2% account
(c) 8,000 in the 5% account and 3,000 in the 2% account
(d) 9,000 in the 5% account and 2,000 in the 2% account