Answer the following questions on performance.

(a) The marketing department at your company has promised your customers that the next system release will show a performance improvement by a factor of two. Your job is to deliver on this promise. You have determined that 80% of the system can be improved. How much would you need to improve this part to meet the overall performance target?

(b) Suppose you are given the task of improving the performance of a system consisting of three major components. The time spent on the first component (refer to as A) accounts for 25% of all execution time. The time spent on the second component (refer to as B) accounts for 20% of all execution time. The time spent on the last component (refer to as C) accounts for 55% of all execution time. By investing $1000 on new parts, you can improve the performance of A by a factor of 2.5, B by a factor of 3, or C by a factor of 1.5. Which choice yields the greatest system improvement?