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Junior high school mathematics solution
Solution: (1) Last year's income was (x+6000) yuan; This year's income is (x+6000)( 1+ 15%) yuan.

This year's expenditure is x( 1- 10%).

∴(x+6000)( 1+ 15%)-x( 1- 10%)= 10000

1. 15x+6900-0.9x = 10000

0.25x=3 100

x= 12400

Namely: last year's income 18400 yuan; This year's income is 2 1 160 yuan.

Expenditure this year 1 1 160 yuan;

(2) This year's income is (x+ 10000) yuan, and last year's income was (x+10000)/(1+15%) yuan.

Last year, the expenditure was x/( 1- 10%) yuan;

∴(x+ 10000)/( 1+ 15%)-x/( 1- 10%)= 6000

(x+ 10000)/ 1. 15-x/0.9 = 6000

0.9(x+ 1000)- 1. 15x = 6000 0.9 1. 15

-0.25x=-2790

x= 1 1 160

That is, this year's income is 2 1 160 yuan, and last year's income is 18400 yuan.

Last year's expenditure 12400 yuan.

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