According to a survey, 100 couples use a particular contraceptive continuoulsy for 2 years. During this period instead of using this contraceptive, 20 women become pregnant. Calculate the pearl index on this contraceptive?

a. 1000 per HWY

b. 10 per HWY

c. 5 per HWY

d. 0.1 per HWY

ANS -