Final answer:
The cost of an oil change with a 70% markup is $30.60.
Step-by-step explanation:
The subject of this question is Business. It is asking about the cost of an oil change with a 70% markup.
To calculate the cost of an oil change with a 70% markup, you need to take the original cost and multiply it by the markup percentage. In this case, the original cost is $18.00.
So the cost of the oil change with a 70% markup would be $18.00 + ($18.00 * 0.70) = $30.60.