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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