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What product or service are you offering? How old is your business? What is your profit margin? It is difficult to answer without more information. If your profit margin is low for your industry then you may want to spend the additional money to increase your profit margin on your product. You may order a larger quantity or manufacture your product to increase your profit margin. If your sales could be higher then marketing or hiring more sales people may be the way to go. What are the specific problems you face can only be determined by reviewing those items to tell you where to spend the extra money.