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 Changing money to 50,20,10,5,1 units optimizing the minimum 
% number of units.
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money=input('How much money do you want to change ? ');

n50= fix(money/50);
rest=rem(money,50);
n20=fix(rest/20);
rest=rem(rest,20);
n10=fix(rest/10);
rest=rem(rest,10);
n5=fix(rest/5);
rest=rem(rest,5);

n1=fix(rest);


disp(['n50:' num2str(n50) '   n20: ' num2str(n20) '  n10: ' num2str(n10)  '  n5: ' num2str(n5)  '  n1:  ' num2str(n1)] );