Some Basic Concepts in Chemistry: JEE Main 2022 Chemistry question

When 800 mL of 0.5 M nitric acid is heated in a beaker, its volume is reduced to half and 11.5 g of nitric acid is evaporated. The molarity of the remaining nitric acid solution is x $\times$ 10^$-$2 M. (Nearest integer) (Molar mass of nitric acid is 63 g mol^$-$1)