It is: (4000-1000)/4000 times 100 = 75% decrease
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400 percent of 1000 = 4000
1500 decreaes to 1000 ==. 1500-1000=500 500/1500 is 33.3333%
4000% of 4000 =4000/100 * 4000 =160,000
800% of 4,000 = 800% * 4000 = 8 * 4000 = 32,000
1000 g = 1 kg → 4000 g = 4000 ÷ 1000 kg = 4 kg