You bring your favorite soccer ball from your place of residence in Portland to your grandparent's house much higher on the mountain. When you arrive, you get the soccer ball out of your bag.  Due to the change in atmospheric pressure, is the ball underinflated or overinflated?   After 15 minutes of playing soccer, you are out of breath even though you are breathing rapidly to compensate for the low oxygen.  Which of the options below is closest to the best possible oxyhemoglobin saturation you could hope for while you are visiting your grandparent?  55%,75%,95%?

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