Extracted text: Exercises Write a Python program to find the repeated items of a tuple. 2) Write a Python program to check whether an element exists within a tuple. 1) 3) Check if all items in the following tuple are the same tuplel = (45, 45, 45, 45) 4) Fractions: You can express a fraction as a tuple: (numerator, denominator). (a) Write a function that multiplies two fractions that are passed as tuples. 5) Blocks of Stock. A block of stock as a number of attributes, including a purchase date, a purchase price, a number of shares, and a ticker symbol. We can record these pieces of information in a tuple for each block of stock and do a number of simple operations on the blocks. Let's dream that we have the following portfolio. Current Purchase Date Purchase Price Shares Symbol Price 25 Jan 2001 43.50 25 CAT 92.45 25 Jan 2001 42.80 50 DD 51.19 25 Jan 2001 42.10 75 EK 34.87 25 Jan 2001 37.58 100 GM 37.58 We can represent each block of stock as a 5-tuple with purchase date, purchase price, shares, ticker symbol and current price. portfolio= [ ( "25-Jan-2001", 43.50, 25, 'CAT', 92.45 ), ( "25-Jan-2001", 42.80, 50, 'DD', 51.19 ), ( "25-Jan-2001", 42.10, 75, 'EK', 34.87 ), ( "25-Jan-2001", 37.58, 100, 'GM', 37.58 )] Develop a function that examines each block, multiplies shares by purchase price and determines the total purchase price of the portfolio. OPEN IN...