Consider a current processor design “P1” which operates at a voltage of 0.8V and a clock period of 0.5 ns. An advanced version of the processor called “P1-adv” will use the same design as “P1”, but with one notable difference: In addition to the normal (0.8V/0.5ns) operating mode, “P1-adv” will include a new operating mode called Turbo mode in which the processor would operate at a voltage of 1.4V and a clock speed of 4 GHz. The purpose of the Turbo mode is to provide performance boost to some critical benchmarks.

Assume that a customer wants P1-adv to achieve a speedup of 1.6 as compared to P1,

when running a web server benchmark. What is the minimum percentage of the benchmark that must be executed in the Turbo mode to achieve the desired speedup?