Margie and four of her friends are eating lunch at a restaurant. the total bill is $52.50 before tax and tip.

part a:
margie has a coupon good for $10 off their total purchase. if sales tax of 6% is collected on the discounted amount, what is the total cost after tax?

part b:
the friends want to give a 20% tip based on the cost of the meal before the discount and sales tax are applied. what is the amount of the tip they will leave>

part c: if the group of friends splits the bill evenly, including tax and tip, what is each person's share?