World production of copper, in millions of tons per year, from 1900 to 2000 is given by C=0.5*1.054' where t is the time in years since 1900. (a) What production level (in millions of tons) does this model give for the year 1980? (Round your answer to two decimal places.) Show your work on paper. Blank 1 million tons. (b) In how many years did the production level of copper reach 7.8 million tons? You have to show your work on pa Blank 2 years. (Round your answer to three decimal places.) +extra 1% if you solve this question using a logarithm. Blank 1 Blank 2 Add your answer Add your answer

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