21 is 1.2352 percent of 17. Just in case you mean the opposite: 17 is .809 percent of 21.
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17.85 years, or about 17 years, 10 months.
To find 75 percent of a number, multiply the number by 0.75. In this instance, 0.75 x 21 = 15.75. Therefore, 75 percent of 21 is equal to 15.75.
17%
17 x 21 = 357
21/30 x 100 = 70. Therefore, 21 is 70 percent of 30.