Instead of multiplying a number by 0.72, a student multiplied

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Instead of multiplying a number by 0.72, a student multiplied it by 7.2. If his answer was 2592 more than the correct answer, then the original number was

Let the original number be x.
According to the question,
7.2 × x – 0.72 × x = 2592
⇒ x (7.2 – 0.72) = 2592
⇒ x × 6.48 = 2592

⇒ x =	2592
	6.48

=	2592 × 100	= 400
	648