Question

Calculators cost the manufacturer $2.16 each to produce. If a markup of $2.16 is added to the cost, what is the selling price?

Answer 1

You're probably overthinking this. The math is really simple.
Your selling price is just:
the cost to the manufacturer + the markup

Answer 2

@BangkokGarrett is right

Answer 3

Hence: $2.16 is added to the cost

Answer 4

and what is the cost?

Answer 5

2.16 + ?

Answer 6

the cost of the manufacturer $2.16?

Answer 7

ok i got it thank you so much to both of you.

Answer 8

np @BangkokGarrett did everything :)

Answer 9

I added 2.16 +2.16 and the answer was wrong