In your opinion, what is a reasonable amount of money to tip someone, and why?

Dear sir/Madam,

There are advantageous and disadvantageous of a tip, advantageous are that if a customer is happy with  good services given (reasonable amount depends on cutomers heart) and its also like helping someone who might be poor but as long as if the company allows for a customer who can give a tip  or an employee can receive tips allowed by the company. Disadvantageous are that money can change an employee by not working properly because he or she are used to receiving tips that can bring bad image to the company,customer care disatisfation or by loosing a customer.

The industry standard is about 10% of total bill.

Of course it depends on situation and/or concept (Fine Dining, Casual, QSR).

10% of the total bill is a very reasonable tip for someone or by determining the quality of service has been provided

The tip you give depends from the way the waiter will serve your diner if he is polite and he is not just leaving the food on the tample and goes away.HE OR SHE MUST serve the wine or the refreshment in the glasses and they can go.If they do this they will take a good tip from the customer.

Proper receiving temperature according to the item you are receiving 

Checking the condition (damaged, spoiled,...)

Checking the packaging (damaged box, unsealed bag,...)

Checking the cleanliness (mainly for vegetables, insects, sand,...)

It solely depends on the client.Any amount can be considerd as a tip as long as it is from th clients free will.

first of all he give facilities he provide their needs that's way the customer give the tip 

if employer care customer then customer will happy and they feel he give us respect and hospitality we will help customer 

then they give tip as a prize 

 There is no reasonable amount  that can appreciate a good service, so tip from your heart and give back the smile and happiness that person gave you will serving u 

If someone feels that they should reward service over and above what they might normally expect, (and bringing the food to the table is a normal expectation) I think that a rule of thumb might be 8 -10% of the bill up to a maximum of 5 SAR per person, i.e. 20 max for a meal for four people what ever the bill. This circumvents the absurdity of paying a larger tip for the opening of a more expensive one.

we need to think about need to revise the tipping system. The 'excuse' given is the poor pay of waiters in restaurants. This needs to be addressed by the employers (and/or legislation - a legally enforceable living wage would be a start). 

A tip, or gratuity, on the other hand is a voluntary payment given over and above the amount of the bill (and, believe it or not, any service charge) as a “personal reward” from you to waiting staff.

well in my opinion if it was for a hotel or valet staff I’d say the amount depends on his u usually deal with him than that may vary on yourself, but if it were at a restaurant for example I’d say 10-15% of the bill depending on how much you enjoyed the service and meal.

I don't think the tip amount is that important. If we talk about monetary assistance to anyone, we need to help under a certain project. Let me to start their own business need 15 thousand dollars.