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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? 
Overseas Competition->Knowledge Point->Word Problem Modules->Solving Problems Involving Fractions and Percentages->Percentages Word Problems
$24 \times 80$\%=$19.2$,  $24-19.2=4.8$,  $4.8$ liters of milk is left with him. 