The income ratio of the Li family in Zhang Jiahe is 8:5, and the expenditure ratio is 8:3. As a result, the Zhang family has the balance of 240 yuan and the Li family has the balance of 270 yuan.
Let's assume that the income of the Zhang family is 8x yuan and that of the Li family is 5x yuan.
(8x-240):(5x-270)=8:3
You can solve 16x= 1440 x=90.
Therefore, the income of the Zhang family is in 720 yuan, while the income of the Li family is in 450 yuan.