printf "\n%s%14s%17s\n", "SALES", "bands", "coils";

printf {t in 1..T}: "week %d%9d%7.1f%%%9d%7.1f%%\n", 
   t,
   Sell["bands",t], 100*Sell["bands",t]/market["bands",t],
   Sell["coils",t], 100*Sell["coils",t]/market["coils",t];