Posted by Bob on Tuesday, November 27, 2012 at 4:11am.
A store manager bought c calculators for $8. All but four were sold for $10 each. The remaining four calculators were not sold. Find the store's profit, in simplified form, in term of c.

algebra  drwls, Tuesday, November 27, 2012 at 5:42am
(c4)*10  8c = 2c 40