Background List inventory contains sublists of the form [cost,quantity]: for several products in a store cost: cost per item quantity. number of items in stock For example, inventory [20.0, 3.0], [18.5, 4.0], [19.3, 2.011 For the first product in inventory, there are 3.0 items in stock and each item costs $20.0 Your Task (a) Write a function inventory_details which accepts parameter inventory and returns an array array A sample output is shown below: C20 [18.5 4. 1 [19.3 2. 11 (b) Write a function product_cost which accepts parameter array (the output from part a) as input and returns the total cost of each product as a 1-dimensional array. The total cost of each product is cal culated using the formula cost*product. A sample output is shown below: 60 74. 38.6] (c) Suppose the store is applying a discount of 30% to all products. Write a function called discount Which accepts parameter array (the output from part a) as input and returns a 2-dimensional array array which contains the discounted cost and the number of items in stock for each product. A sample output is shown below: L [14 [12.95 4. [13.51 2. ]] (d) Write a function total_cost which accepts parameter array (the output from part c) as input and returns a value which is the total cost of ALL products in the store using the discounted cost from part c. The total cost of all products in the store is computed as follows using the sample output shown in part (c) (14.0 3.0) (12.95 4.0) + (13.51 2.0)120.82 A sample output is shown below 120.82