The correct answer would be the first choice. For each picture drawn, the total cost increases by $34.50.
The answer is B.50
Because it’s Plato
If a set contains ‘n’ elements, then the number of proper subsets of the set is 2^n - 1.
In this problem,
n = 4
2^4 - 1 = 16 - 1 = 15 proper subsets