# math

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If the cost of a cell phone has decreased 400% during the past 10 years, does that correspond to a decrease of four times?

• math -

To me, without more data, it doesn't make sense. A decrease of 100% would mean it costs nothing.

If the rate of decrease was constant over the 10 years, it would mean a decrease of 40% each year. Assuming it cost \$100 originally:

\$100
\$60
\$36
\$21.60
\$12.96
\$7.78
That is only after 5 years!

Sorry that I cannot be of more help.

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