Scientific notation is a number with a non-zero digit before a decimal point multiplied by a power of 10:
21500 = 2.15 x 104
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8% of 21,500= 8% * 21500= 0.08 * 21500= 1,720
4% of 21500 = 860
It is 8.9*10^-5 in scientific notation
It is "(scientific notation)".
This number in scientific notation is 9.8x10-5.