Brenda wants to create a formula for computing the total cost of any restaurant dinner bill that includes a 6% sales tax on the bill, a 15% tip on the pre-tax
amount, $5 for parking, and $2.50 for a coat check.

a. Write a simplified expression that can be used to calculate the total cost
of a dinner that cost d dollars before tax and tip are added. Simplify the expression.

b. If dinner before tax and tip comes to $42.50, how much would the total cost be?