e. Assuming that events involving the number of computers and printers sold are independent from day to day, what is the probability that for any given six-day business week, aggregate profit margins equal or exceed variable cost all six days?

Suppose that a weightless rod is placed on a fulcrum, a weight of 10 lbs. is placed on the rod exactly four feet to the right of the fulcrum, and a weight of 5 lbs. is placed on the rod exactly eight feet to the left of the fulcrum, as shown in Figure 3.1