If the cost of a cell phone has decreased 400 during the pas

If the cost of a cell phone has decreased 400% during the past 10 years, does that correspond to a cost decrease of four times? •Explain your answer as though you were talking to someone who has never taken algebra.

Solution

cost os cell phone has decreased 400% in 10 years

therefore , decrease of cost per year = 400% / 10 = 40% per year

cost decreases to .4 times per year

therefore in 10 years cost has decreased .4*10 = 4 times