[cpcs 202 - برمجة 1] لديك سؤال , شيء غير مفهوم ,,, تفضل هنا , موضوع مفيد

[وردة زرقاء]

A computer store sells the following items:
# Item Price (S. R.)

PC 1500
Monitor (LCD) 750
Printer 300

Write a C application that reads the items sold to a customer and the quantity of each item and prints the total price
that customer will pay. The entering of the sold items continues until the cashier enters the value 0 for the item #.
Validate the entering number, so display an error message if the user choose a wrong option.
A store gives discount on the sales according to the following:
a. 10% on sales less than 1000 S.R.
b. 20% on sales between 1001 to 2000 S.R.
c. 30% on sales more than 2001 S.R.
The output of the program displays the price before and after the discount.

أحد يساعدني في حل دا بليز