Directions: Questions 7 to 9 are based on the following figure showing a thermodynamic cycle ABCDA on a P-V diagram. (Figure not available; the cycle ABCDA involves gas state changes with given pressure-volume values from the original paper.) Assuming the gas to be ideal the work done on the gas in taking it from $$A$$ to $$B$$ is

A

$$200R$$

B

$$300R$$

C

$$400R$$

D

$$500R$$