How much does it cost to service a bike?

Excuse me, could you please elaborate on the costs associated with servicing a bike? Are there any standard fees that apply to all bike services, or do they vary depending on the specific type of bike and the extent of the repairs needed? Additionally, is there a way to estimate the potential cost of servicing my bike before bringing it in for repairs, or is it more of a case-by-case basis? I'm interested in understanding the factors that contribute to the final cost, and whether there are any potential cost-saving measures I can take to minimize the expense.