Question: Setting an inequality constraint / range constraint

A and B are 2 parameters in an optimization problem (in the form of number slider). I would like to set a constrain that

A*B = C where C is in the range of 100 to 200

It is easy when C is a fixed value (fixed C and only vary A or B). But is there a way to achieve if C is in a range instead of fixed value?

Thanks a lot.

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