The function f(x)=70n -400 models the profit of the instructor of a guitar class per month, where n is the number of students en rolled in the class. How many students must be enrolled in the class for the instructor to make a profit? How many students must be enrolled in the class if the instructor needs to make 1,000.00 profit per month?
1 answer:
Given: f(x) = 70n - 400 : equation for monthly profit. n = number of students enrolled in the guitar class. 70 refers to the amount charged per student. 400 is the fixed expense made by the instructor. For the instructor to have a profit, the product of 70n must be more than 400. 400/70 = 5.7 or 6 There must be at least 6 students enrolled in class for the instructor to generate profit. f(x) = 70(6) - 400 = 420 - 400 = 20 1000 = 70n - 400 1000 + 400 = 70n 1400 = 70n 1400/70 = n 20 = n There must be 20 students enrolled in class for the instructor to earn 1000 in profit. 1000 = 70(20) - 400 1000 = 1400 - 400 1000 = 1000
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