### calculate a percent difference

why do I always blank on this?

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calculate a percent difference: "percent difference between a known value A and a calculated value B is:

|A - B|

% dif = ------- * 100%

A

In our example, A = 12; B = 12-2*.001148. so their difference, A - B, is simply 2*.001148 and hence percent difference is:

|2*.001148|

% dif = ----------- * 100% = 0.019 %

12

Less than 5% so the assumption that x was negligibly small is good."

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