a box of snacks contained 20 individual packages the newly designed box contains 28 individual packages by what % did the # of individual packages increase​

Keisha makes a large sandwich for a family picnic she takes 1/2 of them the sandwich to the picnic her family eats 3/8 of the whole sandwich what fraction of the whole sandwich does keisha bring back from the picnic

Can someone answer this question? : )

You wanted to draw an enlargement of design that printed on a card that is 4 in by 5