The opportunity cost of producing the 1st unit of wheat is approximately

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1.

Marginalopportunitycost=AmountGainedAmountSacrificed​

Marginal opportunity cost of the 1st unit, that is A-B of steel will be;

=ChangeInTheAmountOfSteelChangeInTheAmountOfWheat​=1−0100−90​

= 10 Units of wheat

2.

As we can see from the table, in order to produce the 56th unit of wheat, the nation should produce 75 units of wheat ( as it is next possible quantity of wheat that can be produced after 55 units of wheat ). When the nation produces 75 units of wheat, the production of steel reduces to 2 units from the earlier 2 units ( when the production of wheat was 55 units, production of steel was 3 units ). Therefore, this means that the nation has to sacrifice 1 unit of steel in order to produce the 56th unit of wheat, which becomes the opportunity cost.

3.

It can be seen from the table that in order to produce the 56th unit of wheat, the nation needs to produce 75 units of wheat ( since it is the next possible quantity that can be produced after 55 units). When the nation produces 75 units of wheat, the production of steel decreases from the earlier 2 units to 2 units ( when the production of wheat was 55 units, the production of steel was 3 units). Accordingly, the nation must sacrifice 1 unit of steel to produce 56 units of wheat, which becomes the opportunity cost.

4.

Amount she has = $10

Piece of lollipop = $1

Piece of candy = $2

Let lollipop be; L, and candy be C

So,

(1*L) + (2*C) = 10

L +2C = 10

we can therefore solve for C and L

C=5−2L​

When, L= 4, then

C= 5 - 4/2 = 3

So when L = 4 and C = 3, then both sides are equal;

(4*1) + (3*2) = 10

Hence the answer is; four lollipops and three candy bars