Posted by **Babs** on Sunday, January 13, 2013 at 4:22pm.

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?

- algebra -
**Reiny**, Sunday, January 13, 2013 at 4:47pm
What is the question?

if the current cost is $x

then the cost 10 years ago was $x/4

- algebra -
**Anonymous**, Sunday, April 19, 2015 at 8:15pm
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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