Last year, Pinwheel Industries introduced a new toy. It costs $6,900 to develop the toy, and $25 to manufacture each toy. Determine an algebraic expression that represents the total cost to produce n of these toys. If the total cost to produce 4,200 toys is $...
a. $6,900 + $25n
b. $25n - $6,900
c. $25n + $6,900
d. $25n - $6,900 + $4,200
