Final answer:
To estimate a 15% tip on $67.25, round it to $70, and then calculate 15% of $70 to get approximately $10.50.
Step-by-step explanation:
To estimate a 15% tip on a dinner bill of $67.25, we first round the bill amount to the nearest ten dollars, which is $70. Next, we find 15% of $70 by multiplying 70 by 0.15. This gives us $10.50. Therefore, a 15% tip on a dinner bill of $67.25, rounded to the nearest ten dollars, is approximately $10.50.
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