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What is the 69 rule?

The Rule of 69 is a simple calculation to estimate the time needed for an investment to double if you know the interest rate and if the interest is compound. For example, if a real estate investor can earn twenty percent on an investment, they divide 69 by the 20 percent return and add 0.35 to the result.

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Investors love to employ rules to help them predict outcomes. For example, there is a one percent rule (a one percent increase in interest rates equates to ten percent less you can borrow to keep the same payment) and a two percent rule (the percentage of a home’s cost that you should be asking for in monthly rent) and more. Some of these rules can help estimate potential results, but others are outdated or possibly never really held much value.

What Is the 69 Percent Rule?

The Rule of 69 is a simple calculation to estimate the time needed for an investment to double if you know the interest rate and if the interest is compound. For example, if a real estate investor can earn twenty percent on an investment, they divide 69 by the 20 percent return and add 0.35 to the result. In this example, the double in value would require 3.8 years. For simplicity’s sake, many investors use the 72 rule instead because you can leave off the .35. Instead, you divide 72 by the rate of return. For example, if the return is ten percent, the Rule of 72 would suggest that the value of the investment will double in 7.2 years.

Do These Rules Make Sense?

These calculations provide a simple back-of-the-envelope formula to forecast doubling time if you invest in something with a fixed return. However, real life doesn't always follow simple recipes. For example, since the Rule of 69 percent relies on compounding, it may not be accurate. That’s because a lower appreciation early in the forecast period will continue to hold down the total gains by reducing the denominator. Here’s an example: Suppose that Joe buys a property and expects a 20 percent return. The Rule of 69 states that the investment would double in 3.8 years. However, if values drop initially, the investment needs to catch up before the compounding can start to increase the value, which will lengthen the timeline.

Appreciation Isn’t Guaranteed

Whether a real estate investment grows in value quickly, slowly, or not at all depends on factors not within the investor's control. Overall economic conditions like inflation and unemployment are significant, as are supply and demand. As with any investment, there is a risk that value will drop rather than increase. Investors should examine their risk tolerance and appetite when deciding whether to purchase a specific property. "Rules" can help as shortcuts for estimating possible growth but can't substitute for due diligence or guarantee outcomes.

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What do teenagers need less of?

Teenagers should not fill up on too many sugary or fatty foods – such as crisps, sweets, cakes, biscuits – or sugary fizzy drinks. These tend to be high in calories but contain few nutrients. Get ideas for healthy food swaps and healthier takeaways.

Teenagers need lots of energy and nutrients because they're still growing. The amount of energy that food and drink contains is measured in kilojoules (kJ) and kilocalories (kcal), commonly just referred to as calories. A report from 2011 estimated the average energy requirements for children aged 13 to 18 to be: Table showing the recommended calorie intake for boys and girls aged 13 to 18 Age Boys Girls 13 10,100kJ or 2,414kcal 9,300kJ or 2,223kcal 14 11,000kJ or 2,629kcal 9,800kJ or 2,342kcal 15 11,800kJ or 2,820kcal 10,000kJ or 2,390kcal 16 12,400kJ or 2,964kcal 10,100kJ or 2,414kcal 17 12,900kJ or 3,083kcal 10,300kJ or 2,462kcal 18 13,200kJ or 3,155kcal 10,300kJ or 2,462kcal However, these figures are only a guide. Young people might need more or less energy depending on a number of factors, including how physically active they are. While the amount of energy teenagers need is important, they should also eat a healthy, balanced diet.

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