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600, and 630 respectively.
It depends on what you are rounding to. 621 to the nearest 10 would be 620 while 621 to the nearest 100 would be 600.
10
There are infinitely many numbers, and their ranges will depend on the level to which the numbers are rounded.To the nearest 600: [300, 900)To the nearest 300: [450. 750)To the nearest 10: [595, 605)To the nearest 5: [597.5, 602.5) and so on.
10% of 600 = 600*10/100 = 60