The correct OmniStudio tools to design a solution that meets these requirements are OmniScript, Calculation Procedures and Matrices, and OmniStudio Action. OmniScript can be used to create a user interface for capturing customer information and displaying suggested products. Calculation Procedures and Matrices can be used to compute the discount percentage per product based on the customer data provided. OmniStudio Action can be used to save the list of suggested products including discounts to Salesforce or an external system. Integration Procedures are not needed for this scenario, as there is no data integration involved. FlexCard is not relevant for this scenario, as it is used to display contextual data on record pages.