I am writing this letter to thank you for your help and concern which is certain to help increase our future cooperation.Due to the fact that the cost of raw materials has moved up greatly and labor cost considerably,it was the weak mark that leaded to the result that my factory suffered heavy losses.During that period,the gerneral trend was downward.However,not only did you help me to readjust prices but also you suggested that I should make a new price list.Therefore,a large number of customers welcome to order our products.With your situation and suggestions,the trend changed and it is upward now because of sales up.All in all,I am thankful for your help considerably.