A persons paycheck at the start of a new contract is 9000 a year, two years later his paycheck is 10, 112.4, how much percentage did his pay

A persons paycheck at the start of a new contract is 9000 a year, two years later his paycheck is 10, 112.4, how much percentage did his paycheck go up in. Please explain

$${\mathtt{10\,112.4}}{\mathtt{\,-\,}}{\mathtt{9\,000}} = {\frac{{\mathtt{5\,562}}}{{\mathtt{5}}}} = {\mathtt{1\,112.4}}$$

$${\frac{{\mathtt{1\,112.4}}}{{\mathtt{9\,000}}}}{\mathtt{\,\times\,}}{\mathtt{100}} = {\frac{{\mathtt{309}}}{{\mathtt{25}}}} = {\mathtt{12.36}}$$

12.36%   rise   

is your answer 12.36%?