If you are going 55 mph, what is your speed in m per second?

Celeste wants to have her hair cut and permed and also go to lunch. she knows she will need $50. the perm cost twice as much as her haircut and she needs $5 for lunch. how much does the perm cost?

I’m still confused on how to work the percentages

Zoe paid $18.60 in sales tax in tips for her dinner the sales tax rate is 11% and she tipped 20% what was the price of zoe’s dinner before sales tax and tips