Question 751903
Let {{{ c }}} = the total cost of the {{{ 10 }}} apples he bought
{{{ c/10 }}} = the original cost / apple
If he steals {{{ 3 }}} and {{{ 1 }}} is rotten, he has {{{ 2 }}} free apples
Now his cost/apple is {{{ c/12 }}}
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He sells {{{ 12 }}} apples at {{{ c/10 }}} for each apple
{{{ 12*(c/10) = (6/5)*c }}} = his total income from apples
Profit = Income - Cost
Profit = {{{ (6/5)*c - c }}}
Profit = {{{ c/5 }}}
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Hope I got it