MATHS EXPERT & EXCEL SHEET BALANCE TEST MANAGEMENT

Im looking for an expert in mathematics, in creating formulas and calculations for working out relationships between metrics that come from product retail values. Expertise in excel and carrying out fixing and demonstration of formulas in excel spreadsheets is also essential. The role is suited to an individual that can solve mathematical problems, and create the formulas that balance out logically in an argument. Eg> If a user wants to assign a profit margin towards the selling of a product, and they know the cost price of the product, the user needs to know how much they can retail the product for on the market, also taking into account the impact of GST [goods and services tax] in the mix. So the actual production cost will add on the cost of GST payable on the retail sale, to the product cost, that must be used in the calculation. The user has two methods of setting pricing: 1. Intended Profit Margin Calculation Method - the user enters in the profit margin they wish to seek. Also the raw cost price of production the product entails [not including the GST - but the model needs to add the cost of GST, to create a true cost price of the product] 2. Choice Of Selling Price Method - the user simply enters in the raw cost price and the retail price they think a customer is willing to pay, to see the results of margins attained. Please refer to attached excel spreadsheet, to which fixes and formulas need to be checked and corrected, so that the sheet balances out.