If one-nineth of a certain number exceeds its one-tenth

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If one-nineth of a certain number exceeds its one-tenth by 4, the number is

1. 320
2. 360
3. 400
4. 440

Correct Option: B

Let the number be n.
According to the question

n	−	n	= 4
9		10

⇒	10n − 9n	= 4
	90

⇒ n = 90 × 4 = 360