Paying a percentage of the bill as wages for the waiter

Q: Certain Muslim restaurants have made it a rule that a 10% hospitality fee (tips for waiters) must be paid over and above the bill. In some cases, it is clearly indicated on menus and notices, and in others, it is not advertised. Is it Islamically correct for restaurants to charge this fee? We, the customer, have no choice in paying this additional tip if we decide to eat there.

Making Salaam before the Imaam

Q: Last Friday I was offering my jumma Salaah in a newly built musjid. I reached a little late but before the sermon started. I was sitting on the 1st floor of the musjid as the ground floor was fully occupied. When the prayer started, in between the speaker stopped working and we were not able to hear the Imaam so few men started calling out for the indication called the takbeer. The place where we were performing Salaah there were few adult brothers and 15-20 childrens of 10-12 years of age. As for the indication few men were calling the takbeer and the children found it too good so they were also shouting the same but at some point it happened we were not able to hear the men's call but the children's call was highly audible as it was louder than the men because the men were on the ground floor and we were few with the children. We didn't know what was going on as to what position the Imaam was in. At last the children said As salamualaikum wa rahmatullah the last 2 words in namaz and we ended our namaz but as we peeped out of the window the Imaam was still in Salaah so basically we ended before the Imaam and we have to re-pray but my question is when we ended our namaaz and Imaam was still in namaaz and we have to repeat it, so can we again join the same namaaz as the Imaam was in the last stage of namaaz but it was not ended?

Silver rings with studs for men

Q: My wedding is yet to come and I am on the look out for a wedding ring for my fiance. I wanted to know can men wear any other ring beside gold as I know gold is haraam for men. Also what if on the ring it has a diamante stud on it? Or does it have to be a plain silver ring weighing less then 4.35g? If you could answer me I would be very grateful.