Liter_To_Gallon (p_Volume NUMBER ( -- p_Volume is a volume in Liter to convert to Gallon 7. Develop the following PL/SQL function called Liter_To_Gallon => Keep the comment text line in the function declaration for a better usability & maintenance. Gallon_To_Liter (p_Volume NUMBER, P_From_TO NUMBER DEFAULT 1 -- p_Volume is a volume in Gallon to convert to Liter ) 8. Develop the following PL/SQL function 9. Transform the function into a stored function (keep the same function name). 10. Test the function by calling it (as an expression) in a SELECT statement. Standardizing an Amount of Money by Conversion to Standard Currency Suppose the column ORDERS.ORDER_TOTAL is the amount of the order expressed in the currency of the country (NLS_TERRITORY) of the Customer; i.e., when the CUSTOMER.NLS_TERRITORY is: CHINA the amount is in CHY, INDIA the amount is in INR, GERMANY and ITALY the amount is in EUR (Euro)