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Combination of characters and numbers

Calculator allows to determine the existing combinations for the user-specified string.  
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Financial

Net return on sales (ROS)

Calculator based on the values ​​entered and net profit calculated return on sales ROS. ROS announces net income (after tax), attributable to every penny of products, goods and services.            
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Chemical

Calculator enthalpy

Enthalpy calculator is used to calculate the heat transfer during the process kwazistatycznego occurring in a closed thermodynamic system under constant pressure (isobaric process).      
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Building

Insulation of wall

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Calculator allows you to calculate the amount of insulation panels needed to cover the walls of the building using the "light wet" or "dry light" methods.
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Building

Calculator VAT refund for building materials

The calculator calculates the amount of VAT that can be refunded in respect of incurred expenses associated with the purchase of construction materials.