Discount store sells items on discounted prices. 
Assume that all numbers are INTEGERS.
The inventory is stored in the 2D list named inventory in the following way:

Number of rows = number of items in the store
Number of columns = 4

First column - prices of all items
Second column - discount percent of Category I items
Third column - discount percent of Category  II items
Forth column - dicount percent of Categoy III items

Pay attention, the numbers in 2, 3, and 4 columns are the same for all items

The discount rule is:
a. Category I: price of the item less than 5 dollars
b. Category II: price is between 5 and 9
c. Category III: items that cost 10 dollars or more 

Write a functon def final_price_list(inventory, row, col) that has 3 parameters - 2D list described above, number of rows and 
number of columns. Function creates and returns 1D list of final prices for all items after discount is applied. Assume that there 
is NO TAX.

Write main to test your function..

For example, if the inventory 2D list is:
2  10 30 15
5  10 30 15
12 10 30 15
9  10 30 15

The function will return the following list:
[1.8, 3.5, 10.2, 6.3]