Equilibrium: JEE Main 2021 Chemistry question

A homogeneous ideal gaseous reaction $A{B_{2(g)}} \rightleftharpoons {A_{(g)}} + 2{B_{(g)}}$ is carried out in a 25 litre flask at 27$^\circ$C. The initial amount of AB₂ was 1 mole and the equilibrium pressure was 1.9 atm. The value of K_p is x $\times$ 10^$-$2. The value of x is _________. (Integer answer) [R = 0.08206 dm³atm K^$-$1mol^$-$1]