A sample of an ideal gas is taken through the cyclic process…

A sample of an ideal gas is taken through the cyclic process abca shown in the figure. The scale of the vertical axis is set by pb = 7.79 kPa and pac = 4.12 kPa. At point a, T = 189 K.  Find the temperature of the gas at point c.Assume Va = 1.86 m3, Vbc = 4.05 m3.