human
Calculate percentage of an amount mentally where the percent is a multiple of 10 Tom and Katie are arguing about working out percentages of amounts.

Tom says to find \( 30 \% \) you divide by \( 3 \).

Katie says to find \( 30 \% \) you divide by \( 100 \) and multiply by \( 3 \).

Who is correct? Both Tom and Katie
gpt
Does not understand a percentage is out of 100