580 yuan. The specific interest rates of agricultural bank loans are: 4.35% for 0 to 6 months (including 6 months), 4.75% for 6 months to 1 year (including 1 year), 4.75% for 1 year (including 3 years) and 4.5% for 3 to 5 years (including 5 years). Because the interest is equal to the principal times the interest rate times the time, and the annual interest rate is 4.35%, the monthly interest is 160000 times 0.0435 times one twentieth and equals 580, which is 580 yuan.