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From the Working with your Business Consultant Professional Calculator series, Manufacturing Consultant booklet, Forecasting Manufacturing Rates of Accessories;
formula
%MAIN = OPTIONSÃ·MAINÃ—100
where
%MAIN = main product percentage
OPTIONS = # optional product units
MAIN = # main product units
"Many products have optional accessories or peripheral products. For
example, cars have lots ot extras, and computers have software and
optional equipment.
The production rates of these optional items are often based on a per-
centage of the sales of the main product. The following equation
helps determine production rates of these optional products.
Although this calculation is simple to do on any calculator, using
SOLVE means that you don't have to reenter values to calculate many op-
tional products for one main product, or try what-if situations
."

SlideRule
Reference URL's
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