years, there has been a growing trend towards healthier eating, and this has led to increased demand for brown bread. A $2022$ survey by the Hartman Group found that $62\%$ of consumers are irying to eat healthier, and $58\%$ are looking for more whole grains in their diet. The following diagram illustrates the impact of an increase in demand for brown bread. Which of the following statements is INCORRECT?

a$)$ Before the increase in demand, the equilibrium price is $R10$ and the equilibrium quantity is $900.$

b$)$ Owing to an increase in demand, the demand curve shifts from D to D$1.$ At a price of R$10,$ after the increase in demand, the quantity demanded is $1200$ and the quantity supplied is $1100.$

c$)$ At a price of R$10,$ after the increase in demand, there is an excess demand.

d$)$ A new equilibrium position is formed after the increase in demand at an equilibrium price of R$12$ and an equilibrium quantity of $1100.$