Ammonium carbonate dissociates as
${\text{NH}}_{\text{2}}{\text{COONH}}_{\text{4}}\text{(s)}\rightleftharpoons {\text{2NH}}_{\text{3}}\text{(g)}\text{+}{\text{CO}}_{\text{2}}\text{(g)}$
In a closed vessel having ammonium carbonate in equilibrium $\mathrm{N}{\mathrm{H}}_3$ is added such that partial pressure of $\mathrm{N}{\mathrm{H}}_3$ now to equals to the original total pressure. The ratio of total pressure now the original pressure is?