A chest freezer can be purchased cash for $3475 or on hire purchase for a deposit 25% and 24 equal monthly instalments of $130.31 A The hire purchase price
B The interest charges
C The percentage interest charged

Assume that there is a 11% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on four independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?