Answer:
Step-by-step explanation:
The total revenue R (in dollars) is directly proportional to the number of units sold x. This means that
R is directly proportional to x
If we introduce a constant of proportionality, k, it becomes
R = kx
When 25 units are sold, the total revenue is $300. We will substitute the value of R and x to get a value for k. It becomes
300 = 25k
K = 300/25 = 12
The mathematical model that relates the total revenue R to the number of units sold x will be
R = 12x
