'COLA''s current control system is focused exclusively on the efficiency of its manufacturing process and it reports monthly on the following variances: material price, material usage and manufacturing labour efficiency. 'COLA' uses standard costing for its manufacturing operations. In 2018, 'COLA' employed 20 teams, each of which is required to install one of its 'HEAT' AC per day for 350 days a year. The average revenue per 'HEAT' AC installed is Rs 36,000. 'COLA' would like to maintain this side of its business at the current level. The 'HEAT' installation teams are paid a basic wage, which is supplemented by a bonus for every AC, they install over the yearly target of 350. The teams make their own arrangements for each installation and some teams work seven days a week, and up to 12 hours a day, to increase their earnings. 'COLA' usually receives one minor complaint each time a 'HEAT' AC is installed and a major complaint for 10% of the 'HEAT' AC installations.

Evaluate the appropriateness of Cola's current control system.