Answer: 

Explanation:
Given
For Friday show 33 balcony and 28 general tickets are sold
For the Saturday show 87 balcony and 80 general
Suppose the price of a balcony ticket is 
 and for general it is
 and for general it is 

so, we can write

Solving (i) and (ii) we get

So, Balcony ticket costs 
 and general tickets costs
 and general tickets costs 
