math
posted by Anonymous .
From a survey of 100 college students, a marketing research company found that 70 students owned iPhones, 45 owned cars, and 40 owned both cars and iPhones.
(a) How many students owned either a car or an iPhone (but not both)?
1 students
(b) How many students do not own either a car or an iPhone?
2 students
I got a. 115 don't know how to get to b

Determine the down payment and the amount to be financed for each home described below.
(a) $360,360; 10% down
The down payment is $ 1
The amount to be financed is $ 2
(b) $960,000; 20% down
The down payment is $ 3
The amount to be financed is $ 4
my answer are a. 36036 financed 324.324
b. 192000 financed is 768,000 is that right