Displaying multiple price for products
I'm guessing you're using commerce kickstart and/or you've got Commerce Extra Price Formatters installed, it has an extension that provides the feature you're displaying, RRPP and your price.

Check out your display options, the second price won't appear automatically until you make it so. Go to admin/structure/types/manage/[your-product-machine-name]/display and verify that your price is being displayed there:



Then click in the link for the settings of the variation type display if you're in kickstart or go to admin/commerce/config/product-variation-types and edit the display for your variation type.



If you're not in kickstart, the url for this same screen would be admin/commerce/products/types

Change the price formatter to Formatted price or whatever other fits for your needs.