To calculate a 20% tip on a $9 payment, you multiply $9 by 0.20:
\[ 9 \times 0.20 = 1.80 \]
So, the tip would be $1.80.
1 answer
To calculate a 20% tip on a $9 payment, you multiply $9 by 0.20:
\[ 9 \times 0.20 = 1.80 \]
So, the tip would be $1.80.