oriole company purchased $18$ calculators for $$20$ each,one half on may $14,$ and the other half on may $22,$ all on account. Oriole sold $16$ of the calculators on may $25$ for $$30$ each. it received payment for $6$ of them on may $30$ and payment for the other $10$ on june $4.$ Oriole paid the supplier for the $5$ calculators on may $21.$ how much revenue should oriole recognize during may?