To find out how many hours Christiana needs to work to make $130, we first account for the $18 tip she will receive.
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Subtract the tip from the total amount needed: \[ 130 - 18 = 112 \] She needs to make $112 from her hourly wage.
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Now we divide this amount by her hourly wage of $14: \[ \frac{112}{14} = 8 \]
Therefore, Christiana should work 8 hours to make $130 after receiving an $18 tip.