Answer :
Since her base salary is $1900, the money she makes by selling copies of History is Fun gets multiplied by $40 and that gets added to her base salary.
So the equation would be = P+40N
Since she sells 24 copies, her total pay would be = 1900+(40*24)
= 1900 + 960
= $2860
So the equation would be = P+40N
Since she sells 24 copies, her total pay would be = 1900+(40*24)
= 1900 + 960
= $2860