If 80% of a number added to 80 gives the result as the number

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If 80% of a number added to 80 gives the result as the number itself, then the number is

1. 200
2. 300
3. 400
4. 500

Correct Option: C

Let the number be N.
According to the question 80% of N + 80 = N

⇒	80N	+ 80 = N
	100

⇒	4N	+ 80 = N
	5

⇒	N	= 80 ⇒ N = 400
	5