Question 1127900
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1 1/5 is larger than 1 1/6, so the cost is higher than the profit.  So the answer from the first tutor doesn't make sense.<br>
The answer from tutor MathTherapy is correct; I would perform the calculations a bit differently.<br>
Multiply the given ratio by the least common denominator of the fractions to get the ratio in whole numbers:<br>
1 1/6: 1 1/5 = 30(1 1/5):30(1 1/6) = 35:36<br>
So the cost price is 36/35 times the profit:<br>
cost = $310*(36/35) = $318.86<br>
Then the selling price is cost plus profit:<br>
$318.86+$310 = $628.86