How much the pressure inside CO2 extinguisher will be if the cylinder exposed to direct sunlight 50C degree?

If V1 = V2 => p1 / T1 = p2 / T2 <=> p2 = p1 * T2 / T1

Let's assume that T1 = 20 C Degree = 313 K

=> p2 = p1 * 343/313 => p2 = 1.10 p1 which means 10% higher pressure.