Trade Surplus

Chefland consists of three countries named $A, B,$ and $C$. - Country $A$ exports goods worth $A_1$ units and imports goods worth $A_2$ units. - Country $B$ exports goods worth $B_1$ units and imports goods worth $B_2$ units. A *trade surplus* occurs when a country exports **strictly more** than it imports. Find whether country $C$ is in *trade surplus*. Note that the countries $A,B,C$ trade