A family has 4 earning members P, Q, R, S. In 2011 their respective shares in the total income was 25%, 35%, 10%, 30% respectively. They spend 40% of the total income and save the remaining. In 2012 P's salary went up by 20%, Q's salary increased by 20% and R's salary decreased by 10% and S's salary decreased by 20%. In 2012 what percent of total family income should they spend to save same amount as in 2011?