tailieunhanh - RealLife Math Phần 7

Tham khảo tài liệu 'reallife math phần 7', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Percentages their assistance to a diner during the course of a meal. The money spent on the tip which is in addition to the cost of the food and the taxes that may apply to the purchase of a meal is therefore an important factor in the measurement of the total cost of food spending outside the home. From the perspective of a server working in a restaurant the correct calculation of the tip is important because it has a direct impact upon their personal income as typically the tips earned by a server for their work will constitute an important part of their earnings. The calculation of a tip involves a percentage-based application usually related to the total amount of the bill not including sales tax. It is generally accepted that a 15 tip recognizes good service while a 20 tip tells the server that the service was outstanding. Tips of less than 10 are treated as an expression of the diner s dissatisfaction with the server and the establishment about the meal. Assume a 15 tip in the following examples 15 15 100 . Where a restaurant bill totals without tax being added to the total to calculate the tip .15 X . Thus the 15 tip on this bill is . It is unusual to leave a precise amount such as this for the tip especially if the bill is being paid by cash. Custom may dictate that if the patron is paying by cash a rounded figure that approximates the 15 will be left for the server perhaps or in this example. Note that when using the 1 method this tip could be also calculated as follows 10 of 5 is 1 of 10 . Thus the total is . COMPOUND INTEREST Bank interest is expressed as a percentage. If funds are left in a bank account as a savings they will attract what is referred to as compound interest which is interest calculated both on the principal amount as well as the accumulated interest over time. For example in Year 1 10 000 is deposited to a bank account that will pay the depositor 4 per year. The interest earned in .

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