Ali is a student at the University. He recently purchased a car for OMRS, 000 to use it for going to the University. Ali also expects that other friends might ask for transportation from him. He...

Ali is a student at the University. He recently purchased a car for OMRS, 000 to use it for going to the University. Ali also expects that other friends might ask for transportation from him. He expects a total monthly revenue of OMR70. He expects fuel cost to be OMR60 per month. One of Ali's friends is a taxi driver. He offered Ali to take him to University for a monthly fee of OMR10, Because he does not have to drive, Ali believes that he can perform online work that would earn him a monthly revenue of OMR30. What is the differential cost in this scenario? Select one: O a. OMR10 O b. OMR50 Oc. OMR30 Od. OMR40 O e. OMR20