If the interest was agreed at that time, you need to add the agreed interest. If there is no agreement, you only need to pay 3000 yuan.

Legal basis: Article 667 of the Civil Code of People's Republic of China (PRC) is a loan contract in which the borrower borrows money from the lender, returns the loan at maturity and pays interest.

Article 668 A loan contract shall be in written form, unless otherwise agreed between natural persons. The contents of a loan contract generally include terms such as loan type, currency, purpose, amount, interest rate, term and repayment method.

Article 669 When concluding a loan contract, the borrower shall provide the true information about the business activities and financial status related to the loan according to the requirements of the lender.