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In absolute terms, the percentage decrease is:

percentage change = (new - old)/old × 100%

= (25 - 100)/100 × 100%

= -75 %

Being negative it means the change is a decrease of 75%

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However, when the cost of money is taken into account it is higher - the buying power of 100 in 1970 was much more than the buying power of 100 in 2018 due to inflation.

I do not know the inflation figures for the 48 years from 1970 to 2018 - it will vary from country to country (and year to year), but if we assume an average of 5% per year (probably an under estimate), then:

100 after 48 years with average annual 5% inflation would cost 100 × (1 + 5/100)⁴⁸

percentage change = (25 - 100 × 1.05⁴⁸)/(100 × 1.05⁴⁸) × 100% ≈ -97.6 %

A decrease of about 97.6%

With inflation at about 7.177% prices double every 10 years; using this as inflation, the decrease is approx 99.1% - in other words they are almost giving the calculator away today.

Q: In 1970 a desktop calculator sold for about 100.00. Today the same type of calculator sells for as little as 25.00. What is the percent of decrease in the cost of desktop calculators?

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This is a decrease of 20%

Percent Decrease = (Original Amount - New Amount)/(Original Amount) * 100% The percent decrease from 220 to 33 is 85%

94% decrease

25% decrease.

40% decrease.

Related questions

It works out as a 25.83% decrease

In actuality, most stores don't sell specific savings calculators. Browsers can use sites like Percent Off Calculator, Bankrate, and Web Winder among others for this type of calculator, but a physical savings calculator is not sold in stores.

You can put the percent number over 100 and multiply it by the number you want to decrease, like 9% decrease from 100 would be 9/100 times 100... If you have a calculator, you can move the decimal place over to the right twice, and mulitply. So 9% would be 0.09.

12.5% decrease.

9.5238% decrease.

Not all calculators have a percent key. Simply do the following: Divide the top of the fraction (numerator) by the bottom (denominator) and multiply the result by one hundred. Example: Convert 7/20 into a percent. 7 divided by 20 is 0.35 Multiply by 100 Gives answer - 35%

the amount of decrease in a percent

20 percent decrease.

20% decrease.

148 to 121 is a percent decrease of 18.24%

The percent decrease from 14 to 9 is 35.71.

The percent decrease of 765 to 153 = 80%