please solve it accordingly

Collins Title wants to evaluate its labor and multi-factor productivity with a new computerized title-search system. The company has a staff of four, each working 8 hours per day (for a payroll cost of Ghc 640) and overhead expenses of Ghc 400 per day. Collins processes and closes on 8 titles each day. The new computerized title-search system will allow the processing of 14 titles per day. Although the staff, their work hours and pay are the same, the overhead expenses are now Ghc 800 pay day. i. Compute: c. Change in labor productivity ii.a. Multifactor productivity for old system b. Multifactor productivity for new system c. Change in multifactor productivity d. If overhead goes to Ghc 960 (rather than Ghc 800), what is the multifactor productivity