The tip cost will be $13.50. The total would be $103.50.
First you round 89.61 to the nearest ten dollars, so it would be 90. Then to find the tip, you can use a calculator and type 90-15%. The number should pop up as 13.5 and you can add it to the rounded total, 90. 90+13.5= 103.5. I hope this helps!
