The cost of the new package is $0.82.
The first step is to convert grams to ounces.
1 gram = 0.035274 ounces
142 grams x 0.035274 = 5.0 ounces
The new package would be 20% more than the old package. The total mass of the new package in percentage terms is 120%(100 + 20%).
120% x 5 ounces = 6.01 ounces.
$0.64 + (0.03 x 6.01) =
$0.64 + 0.18
= $0.82
To learn more about percentages, please check: https://brainly.com/question/25764815