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formula to find principal when %rate is known and amount of tax paid is known ?

it is a simple question, give me a simple answer

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John L. | Experienced Tutor Specializing in Adult Learners and Test PrepExperienced Tutor Specializing in Adult ...
4.9 4.9 (134 lesson ratings) (134)
        The tax can be found by using a the simple formula T=PR ( where T is the tax P the principal and r the rate ) Therefore the principal = tax/rate. The rate could be found by using tax/principal. Hope this helps.