Final answer:
To estimate a 20% tip on a dinner bill of $132.56 by rounding the bill amount to the nearest ten dollars, round the bill to $130. Then, calculate 20% of $130 which is $26, and finally round it to $30.
Step-by-step explanation:
To estimate a 20% tip on a dinner bill of $132.56 by rounding the bill amount to the nearest ten dollars, we first round $132.56 to the nearest ten, which is $130. Then we calculate 20% of $130 by multiplying $130 by 0.2, which equals $26. Finally, we round $26 to the nearest whole number, which is $30.
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