No, Justin's guess of $44.40 is not reasonable. If you take the price of a single box of nails and multiply by the amount of boxes Marissa purchased you get $4.44.
Equation:
.74 x 6 = 4.44
The $4.44 represents how much Marissa spent to buy all six boxes of nails. If Marissa only spent $4.44 then it is not possible for each nail to be $44.40.
