500*60%+(x-1000)80%=1100

问题描述:

500*60%+(x-1000)80%=1100

(x-1000)80%=1100-500*60%
(x-1000)80%=1100-300
(x-1000)80%=800
x-1000=800/80%
x-1000=800*100/80
x-1000=1000
x=1000+1000
x=2000

300+0.8x-800=1100
0.8x=1600
x=2000.

500*60%+(x-1000)80%=1100
300+0.8x-800=1100
0.8x=1100+800-300
0.8x=1600
x=1600/0.8
x=2000