If log 2=0.30103, the number of digits in 4⁵⁰ is

If log₁₀ 2=0.3010 and log₁₀ 3=0.4771, then the value of log₁₀ 1.5 is

If log₁₀ 2=0.3010 and log₁₀ 7=0.8451, then the value of log₁₀ 2.8 is