4000 times 5 equals 20,000. This is calculated by multiplying 4000 by 5, which can be done by simply adding 4000 five times or using multiplication.
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How about: 1*1250*3.2 = 4000
5% equals 5/100, or 1/20. So 5 percent of 4000 is 4000/20 = 200
4000 x 2000 = 8000000
It is: (4000-1000)/4000 times 100 = 75% decrease
It is: 700/4000 times 100 = 17.5%