What is the volume of the balloon at this altitude?

A gas-filled weather balloon with a volume of 42.8 L is released at sea-level, where the prevailing conditions are 755.8 torr and 24.7�C. The balloon can expand to a maximum volume of 900 L. When the balloon rises to an altitude at which the temperature is -5.1�C and the pressure is 0.059 atm