If you're already setting a budget that strictly why not just take the 2 minutes to figure out what pre-tax&tip total would keep you under $10? With 7.5% sales

If you're already setting a budget that strictly why not just take the 2 minutes to figure out what pre-tax&tip total would keep you under $10? With 7.5% sales tax and a reasonable 15% tip 8 dollars pretax comes to 9.80.