Estimate a 15% tip on a dinner bill of $57.86 by first rounding the bill amount to the nearest ten dollars.

$70

Step-by-step explanation:

To add a tip, we must multiply the cost of the bill by 1.15. This will give us the total amount including the tip.

57.86 x 1.15 = 66.539

Because this is money, and it wants us to round to the nearest ten dollars, the cost would be $70. (66.539 is closer to 70 than it is to 60)

step-by-step explanation:

umumumumum

im not sure