The figures are invented. A diagram shows the market for rice, with price ($ per kg) on the vertical axis and quantity (thousand kg per week) on the horizontal axis. Before intervention the equilibrium price is $12 and the quantity is 300. The government pays rice producers a subsidy of $3 per kg. The supply curve shifts down by $3. At the new equilibrium the quantity is 350, consumers pay $11 and producers receive $14 per kg. (i) Calculate the weekly cost of the subsidy to the government. [2] (ii) Calculate the change in consumers' weekly expenditure on rice. [2] (iii) Calculate the change in producers' weekly revenue. [2] (iv) Calculate the welfare loss caused by the subsidy. [2]

HL Paper 3-style calculation (standalone practice; not an IB question).