If the CP of 11 articles is the same as the SP of 10 articles,then find the profit%

(ans-10%) I want to know the steps

Let C.P. of each article is Re. 1.
Then C.P. of 10 articles = Rs.10 , S.P. of  10 articles = C.P. of 11 articles = Rs.11
So profit amount = Rs.11 - Rs.10 = Re.1.
Then, profit percentage = $\frac{\mathrm{profit} \mathrm{amount}\times 100}{\mathrm{C}.\mathrm{P}. \mathrm{of} 10 \mathrm{articles}} = \frac{1\times 100}{10} = 10\%$