This is an exponential growth problem. Exponential growth can be expressed mathematically in the following way:

.
Parameter a presents initial amount.
Parameter r is percentage increase.
Parameter t is time.
An equation that would describe given problem is:

t is the time in years.
I attached the graph of this function.
Answer:
slope: 2/3 intercept is -3
Step-by-step explanation:
67% of final price is $67.
Step-by-step explanation:
Given,
Number of drinks Ben has = 50
Amount paid for each drink = $2
Amount paid for 50 drinks = 50*2
Amount paid for 50 drinks = final price = $100
67% of final price = 
67% of final price = 
67% of final price = $67
67% of final price is $67.
Keywords: multiplication, percentage
Learn more about percentages at:
#LearnwithBrainly
the answer is in the picture above