 
<translate> Bayyana tsarin tunani mataki-mataki sannan kuma amsar karshe. Grover ya sayi kwalaye uku na abin rufe fuska. Ya yi shirin sayar da su a dala 50 kowanne. Idan kowane akwati yana da abin rufe fuska 20, kuma ya sayi akwatuna 3 akan $15, nawa ne ribar da zai samu? <eng> Give the step-by-step reasoning process and then the final answer. Grover bought 3 boxes of face masks. He plans to sell them for $0.50 each. If each box has 20 face masks, and he bought the 3 boxes for $15, how much will be his total profit? 