Answer:
$33600
Step-by-step explanation:
Let x = original car price
Since it is a 25% profit that means we multiply x by 1.25
1.25x = 42000
Divide both sides by 1.25
1.25x/1.25 = 42000/1.25
x = 33600
Since we are given that the student has a brand Y phone, they are one of a sample of only 580 students. Since 80 of those students also own a brand X (they own both) the probability that the random student is one of those is 50/580 = 5/58 = 8.62%
21: N = 25.
22:
1: 19
2: 30