Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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If the cost of lubricating oil increases by 15%, what will be the new cost of a gallon that originally cost $2.00?

$2.20
$2.30
$2.50
$2.75

The correct answer is: $2.30

When calculating the new cost of a gallon of lubricating oil after a 15% increase, it is essential to first determine the amount of the increase. To find the increase, you take the original price of $2.00 and multiply it by 15%, which can be represented as 0.15 in decimal form. The calculation is as follows: Increase = $2.00 × 0.15 = $0.30 Now, add this increase to the original cost. The calculation for the new cost is: New Cost = Original Cost + Increase New Cost = $2.00 + $0.30 = $2.30 Therefore, the new cost of a gallon of lubricating oil after the price increase will be $2.30.