Answer
Total cost is $200-8c$.
Work Step by Step
The cost of CDs is $12c$.
The cost of DVDs is $200-20c$.
total cost=$12c+(200-20c)$
$=12c+(200+(-20c))$
$=200+(12c+(-20c))$
$=200+(-8c)$
$=200-8c$
Use the commutative an associative properties of addition to combine like terms.
