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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.

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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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