Consider a multi-level computer interpreting all levels where: all Level 1 instructions are converted to 4 Level 0 instructions; all Level 2 instructions are converted to 8 Level 1 instructions; all Level 3 instructions are converted to 8 Level 2 instructions; all Level 4 instructions are converted to 4 Level 3 instructions; and all Level 5 instructions are converted to 7 Level 4 instructions. If a Level 0 instruction takes 7.8 ns to fetch, decode, and execute, how many micro seconds does it take to execute an instruction on Level 4? (Give your answer to one decimal place.)