Calculation of the total value created in exchange is as shown below:-
Deltra Surplus is
purchasevalue−AgreedPrice
=$60−$36
=$24
Deirdre Surplus is
= AgreedPrice−Willingtosell
=$36−$32
=$4
Now total value created is
Deltrasurplus+Deirdresurplus
=$24+$4
=$28
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