# algebra

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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 -

What is the question?

if the current cost is \$x
then the cost 10 years ago was \$x/4

• algebra -

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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