Each affiliate enrols 22×12=264 new members in 12 months.
We need 15000 new members in the same time, so we would need more than 56 affiliates because 15000/264=56.82 approx., or a minimum of 57.
To be sure of getting 57 affiliates, this must be 17% of the influencers. Therefore the number of influencers must be more than 57/17%=57/0.17=335 approx.
If we take 336 influencers as the minimum, 17% of 336=57 affiliates, who will enrol 15048 new members, approx., which is a little higher than the target.