(1000x+1000x X 0.5%) - (5000+5000X0.5%)≥1000

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(1000x+1000x X 0.5%) - (5000+5000X0.5%)≥1000
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(1000x+1000x X 0.5%) - (5000+5000X0.5%)≥1000
(1000x+1000x X 0.5%) - (5000+5000X0.5%)≥1000

(1000x+1000x X 0.5%) - (5000+5000X0.5%)≥1000
1000x(1+0.5%)-5000x(1+0.5%)≥1000
x(1+0.5%)-5x(1+0.5%)≥1
-4.02x≥1
x≤-0.249

1000(x+0.5x%)-1000(5+2.5x%)≥1000
1.5x%-5-2.5%x≥1
-1%x≥6
- x≥600
x≤-600

原式化简得:1000x+5x-5000-25≥1000
即:1005x-5025≥1000
解得:x≥1205/201

原式简化得:1000x+5x-5000-25x≥1000
980x≥6000
x≥300/49