INSTALLED BY WINDOW WORLD OF DC, INC. PROFESSIONALS SERVING NORTHERN VIRGINIA, THE DC METRO AREA, MONTGOMERY COUNTY MARYLAND AND PRINCE GEORGE'S COUNTY MARYLAND   This certificate represents a 10% discount to agreed sale price for installation of "LowE/Argon" upgrade only for Window World of DC, Inc.products upon the property at: Address:________________________________________ City:______________________________ State:____ Zip:______ Property Owner(s): ___________________ ___________________ • This certificate is valid only if tendered during the first visit to the above property by an authorized Window World of DC, Inc. sales representative. Date of Salesperson's Visit: _____/_____/_____ Window World of DC Inc. Sales Representative: ____________________ Certificate Value: $ _____________ (Based Upon "LowE/Argon" Upgrade Price Only)