Aparticular instruction set architecture (isa) has four classes of instruction: load/store, fixed-point, floating-point, and branching. load/store instructions all require 2 clock cycles to execute, fixed-point instructions all execute in one clock cycle, floating-point instructions all require 8 clock cycles to execute, and branch instructions take one clock cycle if the branch is successful and two clock cycles if the branch fails. a program is run on a processor with this isa and measurements show that 20% of the instructions executed are load/store, 50% are fixed-point, 5% are floating-point, and the remainder are branches. just 15% of the branches fail. what is the average number of clock cycles per instruction?