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
[tex] \frac{40}{100} x = 9600[/tex]
[tex]x = 9600 \div \frac{40}{100} [/tex]
[tex]x = 9600 \times \frac{100}{40} [/tex]
so
[tex]x = 24000[/tex]
since 40% of 24000 is 9600 it means he had 24000 in total/originally
comment with me if you still don't understand