A following has a shape of a parallelogram Whose box is $28\;cm$ and the corresponding height is $20\;cm$ how many such tiles are required to cover a floor of a area $2800\;cm^2$

Question

$\begin{array}{1 1} 40000\;tiles \\ 50000\;tiles \\ 30000\;tiles \\ 20000\;tiles \end{array} $