The price of a dress is reduced by 25%.when the dress still does not sell, it is reduced by 25% of the reduced price. if the price of the dress after both reductions is $72, what was the original price? round to the nearest

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?