Answer:
0.3667 or 36.67%
Step-by-step explanation:
The probability of getting at least 1 defective hard disk among the 5 (P(X>0)) is equal to 100% minus the probability of getting none defectives (1-P(X=0)).
If 23 out of 25 hard disks are non-defective, the probability is:

The probability that there is at least 1 defective hard disk is 0.3667 or 36.67%.
New balance=previous balance+finance charge+New transaction
First we need to calculate the finance charge in order to find the new balance
Finance charge=2,103.24×(0.144÷12 months)
=25.24
New balance
2,103.24+25.24+280
=2,408.48
Hope it helps!