The unit price of granular bars and bottle water is $1.19 and $1.09 respectively.
Unit price = $7.14 / 6
= $1.19
Unit price = $8.72 / 8
= $1.09
Therefore,
Cost of 7 granola bars and 9 bottles of water is;
= 7 × $1.19 + 9 × $1.09
= $8.33 + $9.81
= $18.14
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