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\[C.P.=list\ price+VAT\%\times list\ price\]

Now, in this question, we will simply put the values of the respective terms and then we will get the value of list price.

As mentioned in the question, we have to find the list price of the watch.

Now, let the list price of the watch be x.

So, on using the formula that is mentioned in the hint, we get the following result

\[\begin{align}

& \Rightarrow C.P.=list\ price+VAT\%\times list\ price \\

& \Rightarrow 825=x+10\%\times x \\

& \Rightarrow 825=x+\dfrac{10}{100}\times x \\

& \Rightarrow 825=\dfrac{110}{100}\times x \\

& \Rightarrow 825=\dfrac{11}{10}\times x \\

& \Rightarrow x=Rs.750 \\

\end{align}\]

Also, without having clarity in the formulae one could never get to the solution.