$24 \times 80$\%=$19.2$,  $24-19.2=4.8$,  $4.8$ liters of milk is left with him. 
A cow gives $24$ liters of milk each day. If the milkman sells $80$\% of the milk, how many liters of milk is left with him? 
* $$4$$ 
* $$4.8$$ 
* $$19.2$$ 
* $$20$$ 