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.
I am glad to solve the above problems for you, and I hope it will help your study!