Beth took out a $20,000 loan for college. she is borrowing money from two banks. bank a charges an interest rate of 8.5%, and bank b charges an interest rate of 10.5%. after one year, beth owes $1,860 in interest. how much money did she borrow from bank a? $10,000 $12,000 $14,000 $16,000 , i need it a lot! i will mark you brainliest!