4 Assuming the budget that Car Trace management assigned for the finance department project is R120,000. Presume the actual cost and earn value of the project are R90,000 and R100,000 respectively. Answer the following questions: (a) Calculate schedule variance and cost variance. (b) Calculate SPI and CPI. (c) How would you describe the performance of the project? Justify your answer. (d) Use the CPI to calculate estimate at completion for this project. Indicate how the project is performing