26666.67 yuan. Assuming that the installment interest rate of Jiangnan Rongtong Card is R, the formula of the amount to be repaid in each installment is repayment amount in each installment = total consumption ÷ installment number+total consumption× R, total consumption is 200,000, installment number is 12, R is the monthly interest rate, and the installment interest rate of credit card will be between 5% and 7%. It can be assumed that r=0.05(5%), and the calculation result is that 26,666.67 yuan needs to be paid each period.