Our Windows application (BILTENDER) will calculate all the costs of Nurol Makina A.Ş’ s projects to make the right offer to bid by using the algorithms and parameters which are given by Nurol Makina A.Ş. BILTENDER will provide a more systematical platform for Nurol Makina A.Ş. to conduct their existing procedures and allow detailed analysis of a new project by taking the parameters such as cost, effects of currency rate, etc. into account. Our application will be used by authorized personel confidentially who works at Nurol Makina A.Ş. and will have no internet access because of the security measures. Users can print out the reports which shows the details of costs and offer. It provides better assumptions about the process of making the offer