3500 yuan. According to Xicai.com's inquiry, the interest is equal to the principal multiplied by the interest rate multiplied by the fixed number of years, so the interest with an annual interest rate of 65,438+3.5% is equal to 100000 multiplied by 0.035 multiplied by 1 equal to 3,500 yuan. Interest refers to the reward that money holders get from borrowers for lending money or monetary capital.