The data in the tables below show quantity demanded and quantity supplied for milk at different prices

a) Equilibrium price and quantity is where Quantity demanded = quantity supplied at same price

So according to the given table, We can see that at price 4 quantity demanded = 5 units and quantity supplied also = 5 units.

So equilibrium price = 4 and equilibrium quantity = 5 units

b) Now if consumers are willing to buy rises by 5 litres at each price, it means now quantity demanded = Old quantity demand + 5 at all level of price.

So now the table will be:

So now according to new quantity demanded table and old supply table. we get that at price = 7, quantity demanded = 8 and quantity supplied is also 8.

So new equilibrium price = 7 and equilibrium quantity = 8