A car component can be produced by either of two manufacturing methods, method A or method B$.$ For

method A the fixed costs are $90000$ per year and the variable costs are $15$ per component. For

method $B$ the fixed costs are $99000$ per year and the variable costs are $10$ per component.

Calculate the break$-$even quantity per year, for which the cost of manufacture is the same whichever

method is used.

Give your answer as an exact value.

Break$-$even quantity: