Add solution for cashier lab and bonus string operations

cashier_system_project.py

@@ -0,0 +1,21 @@
+# used input() to get the item cost from the cashier
+# This section handles getting input values from the cashier (item price and quantity)
+price = float(input("Enter the cost of the item: "))
+quantity =int(input("Enter quantity: "))
+
+# fixed tax rate to be used later assigned directly instead of using input()
+tax_rate =  0.075
+
+# Calculation section: compute subtotal, tax, and total
+subtotal = price * quantity
+tax = subtotal * tax_rate
+total = subtotal + tax
+
+# Output section: display item price, quantity, tax rate, subtotal, tax, and total
+print(f"Price of item: ${price:.2f}")
+print(f"Quantity: {quantity}")
+print(f"Tax rate: {tax_rate*100:.1f}%\n")  
+
+print(f"Subtotal: ${subtotal:.2f}")
+print(f"Tax: ${tax:.2f}")
+print(f"Total: ${total:.2f}")

lab_bonus.py

@@ -0,0 +1,25 @@
+sentence = "We are about to finish the first week of the web development bootcamp using Python It has been an amazing experience full of learning and practice. I got familiar with programming basics, the Command Line, and Git/GitHub fundamentals. I am very excited for the upcoming weeks to apply everything I have learned on real projects."
+word = "Python"
+
+# Length of the sentence
+print("Length of sentence:", len(sentence))
+
+# Index of first occurrence of the word
+print("Index of first occurrence of the word:", sentence.find(word))
+
+# Number of times the word appears
+count = sentence.count(word)
+print(f"The word {word} appears {count} time(s) in the sentence.")
+
+# Sentence in all uppercase
+print("Uppercase:", sentence.upper())
+
+# Sentence in all lowercase
+print("Lowercase:", sentence.lower())
+
+# Replace the word with a new word
+new_sentence = sentence.replace(word, "Python3")
+print("Sentence after replacement:", new_sentence)
+
+# Last character of the sentence
+print("Last character of the sentence:", sentence[-1])