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Guy Bartle's Shop

Guy Bartle is a retired teacher, who still freelances as a programmer, systems analyst, web designer, database manager and spreadsheet builder. This shop provides a wealth of resources for teaching and learning Computing from Year 7 onwards with an emphasis on Programming, GCSE and AS/A Level. There are resources for learning to program in Python for Year 7 onwards and interactive models for AS and A Level specifications: Data Structures, Data Sorts and Compilation. There are also spreadsheet in

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Guy Bartle is a retired teacher, who still freelances as a programmer, systems analyst, web designer, database manager and spreadsheet builder. This shop provides a wealth of resources for teaching and learning Computing from Year 7 onwards with an emphasis on Programming, GCSE and AS/A Level. There are resources for learning to program in Python for Year 7 onwards and interactive models for AS and A Level specifications: Data Structures, Data Sorts and Compilation. There are also spreadsheet in

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Payback Period Calculator (for single Windows PC only)
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Payback Period Calculator (for single Windows PC only)

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Payback Period Calculator models when an initial investment in a business will be repaid within a five-year period, if at all. Sales for each of the five years can be input, as can the initial investment, cost price, desired profit, and whether that profit will be a mark-up or a margin. The payback period is displayed as years and weeks as well as years and months. Revenue, costs, net return and outstanding repayment are calculated for each of the five years. Payback Period Calculator is fully supported by a comprehensive help file which includes an explanation of the difference between mark-up and margin when determining profit and also how to use the system to set a sale price.