 
<translate> Kwuo otú e si atụgharị uche n'isiokwu ahụ, kọwaa nke ọ bụla n'ime ha, ma kwuo ihe bụ azịza ya. Grover zụtara igbe atọ nke ihe nkpuchi ihu. Ọ na-ezube ire ha $0.50 nke ọ bụla. Ọ bụrụ na igbe nke ọ bụla nwere ihe nkpuchi ihu iri abụọ, ma ọ zụrụ igbe atọ ahụ maka dollar iri na ise, ego ole ka ọ ga-erite? <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? 