Final answer:
A $12.00 car wash with a 15% tip requires converting the percent to a decimal and multiplying by the cost, resulting in a $1.80 tip, which is then rounded to $2.
Step-by-step explanation:
Estimating an appropriate tip for a car wash at a standard percentage involves a few simple mathematical calculations. The car wash costs $12.00, and the standard tip percentage is generally around 15%. To calculate the tip, first convert the percentage to a decimal by dividing by 100, which gives us 0.15. Then multiply this decimal by the cost of the car wash:
Tip = $12.00 × 0.15 = $1.80.
After calculating, we see that the tip would be $1.80. However, since we need to round to the nearest whole dollar, the tip would be rounded to $2.