Qn 13 – Kaplan Notes under chapter 13 Tannadens Div

Hi there,

In the question, it says the staffing costs may vary by +-2.5% and the contribution +- by 10% – Now the answer at the back chooses to reduce the staffing cost variation by 2.5% and increase the contribution variation by 10% – why? I do not understand on what basis they chose this? can you add/ subtract as you please as it says +- in the question?

Thanks for your help in advance.

Anu