There isn't really a set formula for this question. As Colo.Sandy said, you can either be detailed and count everything out, or you can do a general estimate just by skimming over the page. It's up to you!
If you're still having trouble, feel free to contact the school and the Student Support Specialists would be happy to help!
Student Support Specialistinfo@winghill.com
1-800-267-1829 (US and Canada)
0800 066 4734 (UK)
1800 358 931 (AUS)
0800 451 979 (NZ)