Why Frustrate?

This week, I was helping a student prepare for a chapter test on percents and their applications.  He went online to take the interactive practice test and this question, and “answer”, left us scratching our heads:

If a student can mentally (correctly) calculate 56/70 as a decimal, then percent… why does he get a big ol’ red “X” for it?  Sorry – just had to vent.  I do not like when the textbook  tries to tell my students how to think.  Grrr.

Why frustrate?

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