1.K=0时.
100(1-0.1x)*100(1+0.16x)≥10260
(100-10x)(100+16x)≥10260
16x^2-60x+26≤0
(4x-13)(2x-1)≤0
1/2≤x≤13/4
因为不亏本
100(1-0.1x)≥80
x≤2
所以1/2≤x≤2