Final answer:
In this case, the total supply of sugar in the domestic market is 30,000 + 400P.
Step-by-step explanation:
To find the total supply of sugar in the domestic market, we need to add the domestic supply and the foreign supply.
1. Domestic supply:
The domestic supply for sugar is given by the equation QSD = 10,000 + 300P, where QSD represents the quantity supplied and P represents the price.
2. Foreign supply:
The foreign supply for sugar is given by the equation QSF = 20,000 + 100P, where QSF represents the quantity supplied and P represents the price.
3. Total supply:
To find the total supply in the domestic market, we need to add the domestic supply and the foreign supply.
Total Supply = Domestic Supply + Foreign Supply
= QSD + QSF
= (10,000 + 300P) + (20,000 + 100P)
= 30,000 + 400P
Therefore, the total supply of sugar in the domestic market is 30,000 + 400P.