A company makes two produts A and B$,$ using a CNC milling machine which is classified as a single resource pool. The resource is available for $900$ minutes per day. The contribution margins for product A and B are $$20$ and $$35$ per unit respectively. The unit loads are $10$ and $20$ minutes per unit.

The company wishes to produce a mix of $60\%$ As and $40\%$ Bs$.$ What is the effective capacity $($units per day$)?$