Find the work done by an ideal gas during a closed cycle 1 – 4 – 3 – 2 – 1 as shown if  P1 = 105 Pa, P0 = 3 ×105 Pa, P2 = 4 ×105 Pa, V2 – V1 = 100 litre and segments 4 – 3 and  2 – 1 of the cycle are parallel to the V – axis.