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www.reference.com/article/calculate-variable-rates-f6e76f609759791

Variable interest rates are actually two rates added together. The first is a fixed rate called "margin" that is based on the credit worthiness of the borrower. The second rate varies and is tied to the movement of a specified index as stipulated in the loan contract.

www.reference.com/article/heart-rate-calculator-521d3d148891e0cc

Target heart rate calculators are tools that are used to determine heart rate ranges for physical exercise, according to Active.com. By accounting for age and exertion level, these calculators give users a good idea of how hard they should be pushing themselves while exercising.

www.reference.com/article/calculate-variable-costs-263de6bbb96ce345

Ready Ratios states that variable costs are calculated by dividing marginal costs over units produced. Variable costs are expenses that vary according to production output, so they rise and fall with a company's level of production.

www.reference.com/article/calculate-maximum-heart-rate-men-ae770ebe477e48e1

The general rule for calculating an individual's maximum heart rate is subtracting their age from 220, reports the American Heart Association. Another commonly used calculation is subtracting the individuals age times 0.67 from 206.9, according to Certified Personal Trainer Marc Perry.

www.reference.com/article/formula-calculate-target-heart-rates-57c734835232b5e0

The formula to calculate target heart rate range is: heart rate = [(220 - age) x 0.50] to [(220 - age) x 0.85]. This target range is 50 to 85 percent of the average maximum heart rate for age, according to the American Heart Association.

www.reference.com/article/energy-rates-calculated-cbe4f140e587a5f1

Energy rates are calculated by adding the base cost of the energy itself and the cost of transporting the energy to the end user. In addition, companies calculate in the costs for weather-related repairs and the expense of maintaining the energy-delivery infrastructure. The time of day also impacts

www.reference.com/article/high-heart-rate-c820c903ace45086

A high heart rate, known as tachycardia, exists when a person's resting pulse exceeds 100 beats per minute, according to Mayo Clinic. The normal heart beat range for a healthy adult is between 60 and 100 beats per minute.

www.reference.com/article/causes-high-heart-rate-15cc945a977b8d88

The causes of a high heart rate include exercise, caffeine consumption, sudden stress, smoking and taking certain medications. In some cases, an elevated heart rate is a sign of heart disease, congenital heart abnormalities, electrolyte imbalances or drinking too much alcohol, reports Mayo Clinic.

www.reference.com/article/should-heart-rate-de185df773d1cf91

The normal resting heart beat for the average adult should range between 60 and 100 beats per minute, as stated by the American Heart Association. Trained athletes can have a lower resting heart rate that ranges between 40 to 60 beats per minute. There are many influencing factors that affect heart

www.reference.com/article/causes-fast-heart-rate-c5439dc09ae9a4e6

According to the American Heart Association, a heart rate of over 100 beats per minute is also referred to as tachycardia and occurs when the heart's electrical signals interfere with the sinoatrial node that is responsible for maintaining a balanced heart rate. Rapid heart rates can be triggered by