Asked by Babs

Hi
I need a formula for the following word problem.
The cost of a cellphone has increased by 400% over 10 years. Does this correspond to a decrease of 4 times its cost?
Answered by Reiny
What is the question?

if the current cost is $x
then the cost 10 years ago was $x/4
Answered by Anonymous
A chemist is using
389
milliliters of a solution of acid and water. If
19.5%
of the solution is acid, how many milliliters of acid are there? Round your answer to the nearest tenth.
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