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x * 1.065 = 319.5

x = 319.5 / 1.065 = 300

in one of the Excel cells you need to put 1.065 (which is the tax rate paid on the cost). Then you can simply take those sum of cells and divide it by the cell containing the tax

I can answer Basic Mathematics questions like: Natural Numbers, Integers, Real Numbers, Complex Numbers, Number Theory, Geometry, Trigonometry, Graph Theory, Square Roots, Basic Integration, Profit-Loss problems, Work-Time problems, Equations etc I can try to answer questions of probability and set theory

Tutoring on allexperts.com since long time**Education/Credentials**

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I was 18th in High School Scholarship examination in Maharashtra State of India.
I was second in Mathematics in Maharashtra State in Secondary School Certificate examination.