Xiaoming’s family had a balance of 5,000 yuan last year, and it is estimated that this year’s balance will be 9,500 yuan. This year’s income is 15% higher than last year’s, and expenditure is 10% lower than last year. What is the income of Xiaoming’s family last year?
小明家去年结余5000元，估计今年可结余9500元，并且今年收入比去年高15%，支出比去年低10%，则小明家去年收入是多少元．
<result>20_000</result>