Question

Explain how you could estimate 16% of $118.56 to check if your answer is reasonable. Please don't copy from another question.

Answer 1

You could round $118.56 up to $120, and then
find 10% and 20% of $120:  $12 and $24.
Then 16% would be roughly halfway between $12 and $24, or about $20.

Check:  0.16($118.56) =  $18.97