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2 answers:
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Using the the density(D)-mass(m)-volume(V) formula 
, we can calculate the volume 
Answer:
Option B. 0.71
Step-by-step explanation:
There are 200 males and 300 female employees in the company.
The percentage of its employees are given who stayed for at least 1, 2 and 3 years.
1 year 2 years 3 years
Male 0.67 0.45 0.20
Female 0.73 0.64 0.39
Number of male employees who stayed at least one year = 0.67 × 200
= 134
Number of female employees who stayed at least 1 year = 0.73 × 300
= 219
Total employees who stayed at least 1 year = 134 + 219 = 353
Total employees in the company = 200 (males) + 300 (females)
= 500 employees
Probability that an employee stayed for at least one year =
= 0.706 ≈ 0.71
Option B 0.71 is the answer.