notebook_price=input('enter notebook price');
notebook_number=input('how many notebooks would you like to buy?');
books_price=input('what is the price of a single book?');
books_number=input('how many books would you like to buy?');
pencil_price=input('how much does a pencil cost?');
pencil_price=input('how many pencils?');
total=notebook_price*notebook_number+books_price*books_number+pencil_price;
['the answer is: ' num2str(total)]