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transposing formulas help?

Make S the subject for;

F - S
D = ----- x 100
S

I assume you are starting with this:

$ D = (\frac {F-S} S ) \times 100. $

Multiply both sides by S, and rearrange:

$ DS = (F-S)100\\ DS + 100S = 100F\\ S(D+100) = 100F\\ S = \frac {100F}{D + 100} $

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