The Rule of 72 is reasonably accurate for low rates of return. The chart below compares the numbers given by the Rule of 72 and the actual number of years it takes an investment to double. Notice that although it gives an estimate, the Rule of 72 is less precise as rates of return increase.

Einstein

The Rule of 72 was discovered by Albert Einstein and he considered it his greatest discovery even over E=MC2 (Squared). He considered it the most powerful force on earth. In its simplest form Einstein explained it this way. When you invest money, you earn interest on your capital.

Popular belief holds that Albert Einstein once said “There is no force in the universe more powerful than compound interest,” and that he in fact invented the famous Rule of 72. The Rule of 72, as you may recall, tells us how many years are required for an investment to double, by dividing the interest rate into 72.

The rule of 70 and the rule of 72 give rough estimates of the number of years it would take for a certain variable to double. When using the rule of 70, the number 70 is used in the calculation. Likewise, when using the rule of 72, the number 72 is used in the calculation.

The Rule of 7 is a determination of the average number of impressions a brand must make on a member of their target market before making a sale. Below are seven ways you can increase the chances of your audience seeing an offer multiple times.

How to Calculate the Rule of 70. Obtain the annual rate of return or growth rate on the investment or variable. Divide 70 by the annual rate of growth or yield.

Percentage Calculator: What is 70 percent of 70? = 49.

You will pay $30 for a item with original price of $100 when discounted 70%. In this example, if you buy an item at $100 with 70% discount, you will pay 100 – 70 = 30 dollars.

You will pay $60 for a item with original price of $200 when discounted 70%. In this example, if you buy an item at $200 with 70% discount, you will pay 200 – 140 = 60 dollars.

Percent Off Table For 70.00

Divide the number by 100 (move the decimal place two places to the left). Multiply this new number by the percentage you want to take off. Subtract the number from step 2 from the original number. This is your percent off number.

Figuring the Discount While 10 percent of any amount is the amount multiplied by 0.1, an easier way to calculate 10 percent is to divide the amount by 10. So, 10 percent of $18.40, divided by 10, equates to $1.84.

Sale Price = $64 (answer). This means the cost of the item to you is $64. You will pay $64 for a item with original price of $80 when discounted 20%. In this example, if you buy an item at $80 with 20% discount, you will pay 80 – 16 = 64 dollars.