What is the volume ratio of a helium balloon at different altitudes?

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A child's helium-filled balloon escapes at sea level and 20.0°C. It reaches an altitude of 3330 m, where the temperature is 5.0°C and the pressure only 0.65 atm. What is the ratio of its volume at this altitude to its volume at sea level?

PV/T=PV/T


i got .94
 
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Did you take into account the drop in air pressure?
What will this do to the volume of the balloon
 


Also, don't forget that the pressure inside the balloon gets a contribution from the tension in the rubber.
 
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