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There are 30/100 x 480 = <<30/100*480=144>>144 lilies in the shop.
There are 45/100 x 480 = <<45/100*480=216>>216 orchids in the shop.
So, the total number of lilies and orchids is 144 + 216 = <<144+216=360>>360.
This means, there are 480 - 360 = <<480-360=120>>120 roses in the shop. Answer: \boxed{120}.