Margo was delighted at the sales of the line of dresses she recently purchased. Because the merchandise was selling so fast, she quickly arranged to receive a second shipment of $720$ dresses from the same vendor. When the merchandise arrived, the existing dress inventory at all of her stores was down to only $120$ units priced at $$40\mathrm{.}00.$ Because Margo's cost on the second shipment was slightly higher, she had to price the new arrivals at $$44$ and decided it would be best to reprice the already existing dresses to the same $$44$ price point. Customers continued to like the style of dresses so much that all of the units sold at full price. Calculate the additional markup percent on the remainder of the first shipment.