Today, everything at a store is on sale. The store offers a 20% discount. B) If the regular price of an item is `x\ `dollars, what is the discount price in dollars?

∠cbe and ∠deb are same-side interior angles.

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answer

ending amount = beginning amount / (2^n)

where "n" = number of half-lives (or elapsed time / half-life)

ending amount = 50 mg / (2 ^10 / 5.3)

ending amount = 50 mg / (2 ^ 1.8867924528)

ending amount = 50 m / 3.6981210597

ending amount = 13.5203794557 mg

or about 13.5 mg remain

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