A ballon with a a capacity of $120$L has an ambient temperature of gas at $20$C and under pressure of $3100$ kPa

a$)$Find the temperature of gas when it expands to internal pressure of $260$ kPa and ballon volume to $1\mathrm{.}2$ m$^3$

b$)$What is the final volume of the ballon if it expands to ambient pressure of $1$ ATMSP with gas temperature of $20$C