John had $\frac{5}{13}$ of the amount of Jessie\textquotesingle s money. Jessie then transferred $$ $600$$ to John. As a result, John\textquotesingle s money became $50 \%$ of the amount of Jessie\textquotesingle s money. How much money did they have in total? $ $$~\uline{~~~~~~~~~~}~ 
Overseas Competition->Knowledge Point->Combinatorics->Patterns of Figures->Change of Quantity