I want an answer for 2-5 using a host variable

thank you

Assignment 2-3 Using IF statements Create a block using an IF statement to perform the action described in Assignment 2-2. Use a scalar variable for the total purchase amount and initialize this variable to different values to test your block your block. Assignment 2-5 Using host variables Create an SQL*Plus variable and modify the block in assignment 2-3 to use a host variable to pro- vide the total purchase amount to the block