Rosa earns $120 per week tutoring math. Each week, she puts $36 from her paycheck in her bank account to save for college. Rosa
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In this question, you know that the machine packs 
of a box every 
of a minute. Since it is constant, you simply have to double the half a minute to a full minute and then also double the rate to get 
boxes packed per minute. And 
is equal to 