Find original cost based on fractional purchase

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How would I go about finding the original cost of bitcoin knowing that $20 purchased .0531401 of bitcoin? I would like to know what the cost of 1 bitcoin was at the time of purchase?

20 / X = .0531401
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Let BTC be the amount you want, that is the price of one BitCoin.

If $$ 0.0531401\cdot BTC = $20$$ Then

$$BTC = \frac{$20}{0.0531401} = $376.36 $$