function [priceitems]= price(n,item)
%
% items pricesw computation
%
book_price=100;
notebookprice=1.5;
pencilprice=0.8;
switch item
    case{'book'}
        y=book_price*n;
        if(n>10)          
            y= book_price*n*0.95;
        end
    case{'notebook'}
        y=book_price*n;
        if(n>20)
            y= notebookprice*n*0.9;
        end
    case{'pencil'}
        y=pencilprice*n;
        if(n>30)
            y= pencilprice*n*0.85;
        end
    otherwise
        disp(['Unknown Item:' item])
        y=nan
     
end
priceitems=y;