2010011203

The March price of a T-shirt and shorts was $900\mathrm{CZK}$ together. In April there was on store price adjustment. The price of the shorts decreased by $20\mathrm{\%}$ and the price of the T-shirt increased by $20\mathrm{\%}$. So the April price of both together the shorts and the T-shirt was by $40\mathrm{CZK}$ lower. What was the April price of the T-shirt?