I (junior employee) was asked if I could chip in 7 USD per month for monthly birthday parties at work (a new initiative). It seems that not every employee on my team was asked and it doesn’t make sense to give a set amount when we can just divide the cost (e.g. cake and drinks) among the team of 15+. I also overheard the boss talking about performance review. AITA if I said yes on the spot (out of shock) but later change my mind?