A pen and a pencil set cost $56 if the pen were to go on sale for half the price the cost of the pen and pencil set would be $35 what is the price of the pencil alone Please hurry in 10 minutes

Using pert, adam munson was able to determine that the expected project completion time for the construction of a pleasure yacht is 21 months, and the project variance is 4. a) what is the probability that the project will be completed in 17 months? b) what is the probability that the project will be completed in 20 months? c) what is the probability that the project will be completed in 23 months? d) what is the probability that the project will be completed in 25 months? e) what is the due date that yields a 95% chance of completion?