💻 Activity: Practice with Variables and Operators

1.2.1 Using Variables to Make a Price List

You are working for your favorite grocer and they want you to calculate the price of goods at checkout. Here is a list of prices:

Item	Price per pound
Apples	$1.50
Oranges	$2.00
Bananas	$0.75
Carrots	$1.25
Beef	$5.00
Salmon	$8.00
Shrimp	$9.00

Item	Quantity	Price
Bread	1 loaf	$3.00
Milk	1 gallon	$3.50
Eggs	1 dozen	$3.00
Cheese	1 lb	$5.00
Yogurt	6 pack	$4.50

Purchases:

Item	Quantity
Apples	3 lbs
Oranges	2 lbs
Bananas	1 lb
Carrots	0.5 lb
Bread	1 loaf
Milk	1 gallon
Eggs	1 dozen
Cheese	1 lb
Yogurt	6 pack

A. Write a python script to calculate your bill. B. Write a print statement the prints the total cost of your bill.

# your solution goes here

# Declare and assign values to variables for the cost of each item
Apples = 1.50
Oranges = 2.00
Bananas = 0.75
Carrots = 1.25
Beef = 5.00
Salmon = 8.00
Shrimp = 9.00
Bread = 3.00
Milk = 3.50
Eggs = 3.00
Cheese = 5.00
Yogurt = 4.50

bill = 0
bill += Apples * 3
bill += Oranges * 2
bill += Bananas * 1
bill += Carrots * 0.5
bill += Milk
bill += Eggs
bill += Cheese
bill += Yogurt

# Print the total cost
print(f"The total cost of the groceries is ${bill:.2f}.")

The total cost of the groceries is $25.88.

1.2.2 Planning for Paving a Driveway

You are tasked with ordering asphalt to pave a driveway that is 12 feet wide, and 28 feet long. You want the end pavement to be 3 inches thick. When water is added to mix the asphalt it expands by 20% in volume, after pouring the asphalt reduces in volume by 31 percent. How much asphalt mix will you need to purchase. If it costs $1.03/cubic ft., what is the cost? You should include a safety factor (an excess) of 10% for material lost during processing.

# Your solution goes here

# width of the driveway in feet
width = 12

# length of the driveway in feet
length = 28

# thickness of the pavement in inches
thickness = 3

# safety factor to account for material lost during processing
safety_factor = 1.1

# expansion factor due to adding water
expansion_factor = 1.2

# shrinkage factor due to the asphalt setting
shrinkage_factor = 0.69

# cost in dollars
cost = 1.03

# Convert the thickness from inches to feet
thickness_in_feet = thickness / 12

# Calculate the area of the driveway in square feet
area = width * length

# Calculate the volume of the asphalt needed in cubic feet when set
volume_needed_set = area * thickness_in_feet * safety_factor

# Calculates the volume needed to pour
volume_poured = volume_needed_set / shrinkage_factor

# Calculates the volume needed to purchase
volume_purchased = volume_poured / expansion_factor

# Print the total amount of asphalt needed
print(
    f"You will need to purchase {volume_purchased:.2f} cubic feet of asphalt mix, equating to a price of {cost*volume_purchased:.2f} "
)

You will need to purchase 111.59 cubic feet of asphalt mix, equating to a price of 114.94 

After you do the calculation your boss runs back to you and says he found a product that expands by 30 percent on mixing and shrinks by 12 percent on setting. The problem is it cost $1.40/cubic ft.. Which product should you go with?

# Your solution goes here

# width of the driveway in feet
width = 12

# length of the driveway in feet
length = 28

# thickness of the pavement in inches
thickness = 3

# safety factor to account for material lost during processing
safety_factor = 1.1

# expansion factor due to adding water
expansion_factor = 1.3

# shrinkage factor due to the asphalt setting
shrinkage_factor = 0.88

# cost in dollars
cost = 1.40

# Convert the thickness from inches to feet
thickness_in_feet = thickness / 12

# Calculate the area of the driveway in square feet
area = width * length

# Calculate the volume of the asphalt needed in cubic feet when set
volume_needed_set = area * thickness_in_feet * safety_factor

# Calculates the volume needed to pour
volume_poured = volume_needed_set / shrinkage_factor

# Calculates the volume needed to purchase
volume_purchased = volume_poured / expansion_factor

# Print the total amount of asphalt needed
print(
    f"You will need to purchase {volume_purchased:.2f} cubic feet of asphalt mix, equating to a price of {cost*volume_purchased:.2f} "
)

You will need to purchase 80.77 cubic feet of asphalt mix, equating to a price of 113.08