We apply the rule of three:
Liters..................Price
5..........................3.98
2........................... x
5 is multiplied by 3.98, and the result of this multiplication is divided by 2.
5 × 3.98 ÷ 2
19.9 ÷ 2
= 9.95
Therefore, 5 liters of water costs $ 9.95.
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