Answer
$$ 70.14 \ dollars $$
Work Step by Step
We first estimate the sum by rounding the costs to the nearest dollar:
$$ =4 \ dollars + 40 \ dollars + (2)(3 \ dollars) + 20 \ dollars \\ 4 \ dollars + 40 \ dollars + 6 \ dollars + 20 \ dollars \\ 70 \ dollars $$
The exact value is:
$$ =3.93 \ dollars + 39.99 \ dollars + (2)(2.99 \ dollars) + 20.24 \ dollars \\ =3.93+39.99+5.98+20.24 \ dollars \\ = 70.14 \ dollars $$
