Aman gives 40% of his money to his children and 20% of the remaining to a trust. if he is still left with rs. 9600, what did he originally have?

So he totally gave 60% out which remained 40% with him from the question it means that 9600 is the remaining percent he has which is 40%.
So we need to calculate which values 40% is equal to 9600



so

since 40% of 24000 is 9600 it means he had 24000 in total/originally
comment with me if you still don't understand

In this problem it decreased 20%