For US money-21500 pennies would equal $215. There are 100 pennies to a dollar.
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8% of 21,500= 8% * 21500= 0.08 * 21500= 1,720
4% of 21500 = 860
21500 m.
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
4000000 pennies is exactly 4000000 pennies.