Using proportions, it is found that the fixed amount that she earns for each television is of $70.
A proportion is a fraction of a total amount, and the measures are related using a rule of three.
In this problem, she sold 13 televisions with warranty, hence earning a total in bonus of 13 x $30 = $390.
Hence, the sum of the 13 fixed amounts is of 1300 - 390 = 910, hence the fixed amount she earns is given by:
$910/13 = 70.
More can be learned about proportions at https://brainly.com/question/24372153
#SPJ1
