[tex]\rm x-\frac{x}{10}=\frac{9x}{10} \\ \\ \frac{9x}{10}-\frac{15}{100}\cdot \frac{9x}{10} = \frac{900x-135x}{1000}=\frac{765x}{1000}=\frac{153x}{200} \\ \\ 153x=200\cdot 1377 \longrightarrow x=\frac{200\cdot 1377}{153} \\ \\ \boxed{\bold{x=1800~lei}}[/tex]
