Final answer:
To calculate the percent decrease in the number of students enrolled in the photography club, subtract the final number of students from the initial number of students, divide by the initial number, and multiply by 100. In this case, the percent decrease is 30%.
Step-by-step explanation:
To calculate the percent decrease in the number of students enrolled in the photography club, we first need to find the difference between the initial number of students and the final number of students.
The initial number of students enrolled in the club is 40 and the final number is 28, so the difference is 40 - 28 = 12.
Next, we divide the difference by the initial number of students and multiply by 100 to get the percent decrease. In this case, (12 / 40) * 100 = 30%.
Therefore, there is a 30% decrease in the number of students enrolled in the photography club.