Answer: A = 24 , B = 12.85, C = 8.57
Step-by-step explanation:
Since we have given that
Number of coupons for 1 month = 20
Number of coupons extended for 1.5 months = 10
Number of coupons extended for 2 months = 5
Total number of coupons is given by

1 month = 30 days
So, Expected value of extended membership = A+B+C
Here, A is given by

B is given by

C is given by

So, The expected value of extended membership is given by

Hence, A = 24 , B = 12.85, C = 8.57