In a study 400 smokers and 600 non-smokers were followed up over a period of

In a study 400 smokers and 600 non-smokers were followed up over a period of 10 years to find out the incidence of hypertension. The following table summarizes the data at the end of the study:

Hypertension Yes No Total
Smoking Yes 120 280 400
No 30 570 600
Total 150 850 1000
The risk ratio in this study is

a) 0.06
b) 0.60
c) 6.0
d) 60.0

Answer 3