I already solved steps from 1 to 6 , so help me to solve steps from 7 to 14 . the code with SQL language.

Temperature Conversion To convert a temperature value measured in degree Fahrenheit (F) to Celsius (C) use the formula: (OF - 32) *5/9 = 9C (1) Examples 32 F corresponds to 0C 100 nF converts into C as follows: (100 F 32) 5/9 = 37.78 C, and using the same formula (1) 4 F = -15.56C 1. Develop a PL/SQL function called Fahrenheit_To_Celsius Fahrenheit_To_Celsius (P_Temperature NUMBER p_Temperature is in Fahrenheit / that accepts as input a "Fahrenheit value (p_Temperature) and returns its correspnding Celsius temperture. Important Tip. In order to force the function to succeed even when an exception is raised, include a generic exception handler that must return a special value (that could never be a temperature like 9999). Note that a stored function that does not use a DB table is callable in a SELECT statement as if it were a built-in function. In the next questions, you will call your developed functions as expression in a SELECT for testing. 2. Transform the function into a stored function (keep the same name of function as previous). 3. Test the function within a SELECT statement. Celsius_To_Fahrenheit (p_Temperature NUMBER /* P_Temperature is in Celsius */ ) 4. Develop a PL/SQL function called Celsius_To_Fahrenheit that accepts as input a "Celsius value (p_Temperature ) and returns its corresponding Fahrenheit temperature. 5. Transform the function into a stored function (keep the same name of function). 6. Test the function by calling it (as an expression) in a SELECT statement Standardizing Volume by Conversion (Gallon-Liter) To convert Liters to Gallons, multiply the liter value by 0.26417205236 or divide by 3.785411784. Example 20 Liters = 20 * 0.26417205236 = 5.28344105 Gallons. 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).... In fact, there are eight (8) different countries in the CUSTOMERS.NLS TERRITORY column (you can display). Before summing the amounts of the column ORDERS.ORDER_TOTAL) we need to convert them to the same currency. Let us convert to Euro for example. For this purpose, we prepare the following table of change-rates of currencies to Euro: CURRENCY RATES TABLE CUR_SIGN COUNTRY CUR QTY EURO_RATE CHINA INDA SWITZERLAN CNY INR CHF 1 1 1 0.13 0.011 0.92 1 1 THB JPY EUR USD EUR THAILAND JAPAN ITALY AMERICA GERMANY 1 0.027 0.0079 1 0.81 1 1 1 11. Execute the script BuildCurrency_Rates.sql to create the CURRENCY_RATES table and insert the 8 lines above. 12. Use the CREATE and SELECT statements to create, from the tables ORDERS and CUSTOMERS, a new table called ORDERS_IN_EURO (ORDER_ID, CUSTOMER_ID, COUNTRY, ORDER_TOTAL, ORDER_TOTAL_EURO). Note the COUNTRY is the value of NLS TERRITORY column in the CUSTOMERS table. You should get 105 rows. 13. Write a PL/SQL function to populate the column ORDER_TOTAL_EURO that will contain the total of the order converted to EURO. 14. Check the content of some rows in the ORDER_TOTAL_EURO is correct