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Junior Regional Olympiad - FBH 2014 Grade 7 Problem 2

Source:

October 3, 2018
Percents

Problem Statement

We know that raw wheat has 70%70\% moisture and dry wheat has 10%10\% moisture. One miller bought 33 tons of raw wheat with price of 0.4$0.4 \$ per kilo. At which price miller has to sell dry wheat, so he gets 80%80\% profit?
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