PERCENTAGE

Let's say that the price of the item is $x$ . Then by using information in the problem we can make an equation:

$x(1 - \frac{25}{100})(1 - \frac{10}{100})(1 + \frac{y}{100}) = x$ , Let's multiply both sides by $x$ and simplify the equation a little bit:

$0.675(1 + \frac{y}{100}) = 1$ , now we can take either one of 2 ways to calculate answer:

1) $1+ \frac{y}{100} = \frac{1}{0.675}$

$\frac{y}{100} = \frac{1 - 0.675}{0.675}$

$y = \frac{325}{0.675}$

$y ≈ \boxed{48}$

Or we could have done this problem like that:

2) $0.675 + 0.00675y = 1$

$0.00675y = 0.325$

$y = \frac{0.325}{0.00675}$

$y ≈ \boxed{48}$

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Very nice problem!