Answer:

' Retail price calculator
' with markup entered by the user
' for each item.
' Greeting message and blank lines added.
PRINT "Welcome to the retail price calculator."
DO     
  PRINT "Enter the amount of markup in percent"
  INPUT MARKUP
  LET RATE = 1 + MARKUP / 100
  PRINT "The price multiplier is:", RATE
  PRINT "Enter wholesale price"            ' ask the user for the wholesale price 
  INPUT WHOLESALE                          ' get the price, put it in a variable
  PRINT "Retail price:", WHOLESALE * RATE  ' compute and print out the retail price
  PRINT                                    ' print blank line
LOOP
END

Review

The greeting is printed just once. The blank line is printed for each item, just after the retail price is printed. The output of the program now is:

Welcome to the retail price calculator.
Enter the amount of markup in percent
? 50
The price multiplier is:    1.50
Enter wholesale price
? 100
Retail price:   150

Enter the amount of markup in percent
? 15
The price multiplier is:    1.15
Enter wholesale price
? 100
Retail price:   115

Enter the amount of markup in percent
? 10
The price multiplier is:    1.1
Enter wholesale price
? 100
Retail price:   110

Enter the amount of markup in percent
?

Its time for you to write some loops on your own. Let us first review by writing a simple program.

QUESTION 17:

Write a program that writes "Hello World" on the monitor screen again and again without end (until you hit CONTROL-BREAK).