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When you subtract from the sale price from the original price, divide that difference by the original price, then multiply times 100, you get the discount rate.
So first, what is the difference in price? 259.99 - 199.99 = 60.00.
The discount rate = 100% * (60/259...

The reason that the answer is B is that radon breaks down into radioactive forms of three heavy metals, polonium, lead, and bismuth, and the last sentence states:"The health problems associated with radon arise from the radioactive products of its disintegration,
mentioned above." Those...

Assuming constant water density, pressure increases by 1 atm ( about 100.9 kPa ) with each 10 m of depth below the surface. So at 10 m, the pressure is 2 atm (1 atm of air + 1 atm of water) or 201.8 kPa.
At 18 atm, the pressure is 282.3 kPa. Now for Boyle's law, you now have...