Answer:
66.7%
Step-by-step explanation:
Given that,
Design capacity = 6 furnaces per day
Effective capacity = 5 furnaces per day
Efficiency ratio if it repairs an average of 4 furnaces per day:
= (Actual capacity ÷ Possible capacity) × 100
= (4 per day ÷ 6 per day) × 100
= 0.667 × 100
= 66.7%
Therefore, the efficiency ratio is 66.7 percent.