Answer is option C (i) is wrong because 15% families own both a car and a phone not 10% total 200000 families are there. Let number of families be n so families that own only car is 0.2n-30,000 and families that own phone are 0.9n-30,000 so 0.2n-30,000+0.9n-30,000+30,000+0.05n=n solving that we get n=200000.
now there are 30,000 families that own a car and phone so 30,000*100/200000=15% there 10,000 families that own a car and 180000 families that own a phone so 10,000+180000=190000 that own a car or phone so it is 95% of families.