Explanation:
log₁₀1.5 + 3 log₁₀2 − log₁₀0.3
log₁₀1.5 + log₁₀23 − log₁₀0.3
[log₁₀(1.5 x 23) ÷ log₁₀0.3]
[log₁₀(15/10 x 8 ) ÷ log₁₀( 3/10)]
log₁₀(15/10 x 8 x 10/3 )
log₁₀40