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Logarithm help

Use logarithms for these questions
After every 10 pages of painting, the ribbon in the dot matrix printer loses about 0.5% of its ink.
A) What percent of the ink is left in the ribbon after printing 100 pages and 1000 pages
B) write an equation which expresses the percent p of ink left in the ribbon as a function of the number n of pages printed.
c) Approximately how many pages can be printed before the ink content is reduced to 75% of its original content?

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  1. the fraction left after n pages is

    p(n) = 0.995^(n/10)

    Now you can use that to answer the other two parts.

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