A company predicts that, in July, its sales volume will be 10\% lower and its contribution per unit will be 5\% lower than in June. During June, it produced and sold $50000$ units. The total contribution amounted to $80000$. Its fixed costs were $2000$ and they remained the same in July. What is the decrease in its profit in July compared with June?
- A$4000
- B$8000
- C$11600
- D$13600