6. (4 points) Multiple jobs can run in parallel and finish faster than if they had run sequentially. Suppose that two jobs each needing 30 minutes of CPU time start simultaneously. How long will the last one take to complete if they run sequentially? How long will the last one take to complete if they run in parallel? Assume 50% I/O wait. Show how you came up with your answer.

Assume the existence of a bankaccount class. define a derived class, savingsaccount that contains two instance variables: the first a double, named interestrate, and the second an integer named interesttype. the value of the interesttype variable can be 1 for simple interest and 2 for compound interest. there is also a constructor that accepts two parameters: a double that is used to initialize the interestrate variable, and a string that you may assume will contain either "simple", or "compound", and which should be used to initialize the interesttype variable appropriately. there should also be a pair of functions getinterestrate and getinteresttype that return the values of the corresponding data members (as double and int respectively).