Mary has a monthly salary of $1200.00. She spends $240.00 per month on food. What percent of her monthly salary does she spend on food? I came up with the answer of 20%.

Right, again! :-)

54 To calculate the percentage of Mary's monthly salary that she spends on food, you need to divide the amount she spends on food by her monthly salary and then multiply by 100.

Step 1: Divide the amount spent on food by the monthly salary:
240 / 1200 = 0.2

Step 2: Multiply the result by 100 to convert it to a percentage:
0.2 * 100 = 20%

So, Mary spends 20% of her monthly salary on food. Your answer of 20% is correct.