Question

When a customer wants to buy a ticket, the clerk at the ticket window asks the visitor if they need the armrests, and if so, which of them: left, right, or both. We know that out of the audience expected to show up, l of them only need the left armrest, r of them need just the right one, z need none and b need both. Your task is to calculate the maximum number of people that can attend the show. In the cinema hall there are n rows with m seats each. There is only one armrest between two adjacent seats. Seats at the beginning and at the end of the row have two armrests

Answer 1

which is this simple interest or percentage