The monthly interest is 105 yuan. The principal of monthly repayment is: 7000/24=291.67 yuan, and the interest of monthly repayment is: 7000x1.5%=105 yuan. Bank of China credit card installments can be divided into 3, 6, 9, 12, 18 and 24 installments. The interest for 3 installments is calculated at 1.95%, for 6 installments is calculated at 3.6%, and for 9 installments The interest is calculated at 5.4%, the interest divided into 12 installments is calculated at 7.2%, the interest divided into 18 installments is calculated at 11.7%, and the interest divided into 24 installments is calculated at 15%.