The Branson Corporation is considering a change in its cash$-$only policy. The new terms would be net one period. The required return is $2\mathrm{.}5$ percent per period.

Current Policy New Policy

Price per unit $ $89$ $ $91$

Cost per unit $ $49$ $ $49$

Unit sales per month $4,850?$

What is the break$-$even quantity for the new credit policy?