57.1429
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1. Change 70% to a decimal =0.70 2. Multiply 4,000 by 0.70 = 2800 Therefore, 70% of 4,000 is 2,800
If you know how to multiply and divide, the solution is easy. Divide 4000 by 100 and you get the answer of 40. If you look at the number of zeroes, you know that the answer must have one zero, as 4000 has three zeroes, and 100 only has two.
40
Percentage decrease from 70 to 30 is ((70 - 30)/70) x 100 = (40/70) x 100 = 4000/70 = 400/7 = 57.14%
8.7571