I am with the other comments. My first graphic designer job paid 27 and this was many many years ago. At that wage I would expect someone straight out of uni and in that case the ideal would be to put them in an environment that they would be able to learn and grow, with people or systems around that would teach them the career.
@Muppetteer the ad does read as quite demanding, I think it could be rephrased better. For example no mention of it being for charity. If you are asking people to work overtime I’d suggest adding perks or time in lieu (maybe not needed on the ad). More detail may help you in other areas.
If you are looking for someone to do what you detailed in the second post I’d suggest 3/4 days a week on the same salary and get someone who is a year or 2 into being a junior designer and is willing to do that type of templated work.