3) Cost of an oil change: \( \$ 18.00 \) Markup: \( 70 \% \)

Did you know that the cost of an oil change often varies depending on where you go? While an oil change might only cost you around $18.00 at some budget-friendly spots, you could end up paying double or even triple at premium dealerships. It's a classic case of "you get what you pay for," as the quality of oil and service can really impact your engine’s longevity! When it comes to markup, a 70% increase on that $18.00 puts the selling price at a tidy \( \$30.60 \). Just because something's marked up doesn’t mean it’s not worth it! Often, the additional costs cover not just the oil and filter, but also labor and expertise. Always make sure to check if your service includes extra perks like a tire rotation or a fluid check!