In a wheat experiment field of a certain farm, the average yield of wheat per hectare in the previous year was 480 kilograms, and the average yield of wheat per hectare increased by 12% last year compared with the previous year. How much was the average yield of wheat per hectare last year?
某农场的一块小麦试验田，前年平均每公亩产小麦480千克，去年比前年平均每公亩产小麦增产12%，去年平均每公亩产小麦多少千克？
<result>537</result>