billy is paid at the hourly rate of £4.52 an hour. if he works for 36 hours, how much money does he earn?

Ineed to learn how to solve this problem

Me n o w. i need t h i s. 10 points

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?