gistfile1.txt

class Student < Person
    def initialize(firstName, lastName, id, scores)
        super(firstName, lastName, id,)
        @scores = scores
    end
    def calculate()
        fin = 0
        @scores.each do |x|
            fin += x
        end
        fin /= 2
     puts "O" if fin >= 90 && fin <= 100
     puts "E" if fin >= 80 && fin < 90
     puts "A" if fin >= 70 && fin <= 80
     puts "P" if fin >= 55 && fin < 70
     puts "D" if fin >= 40 && fin < 55
     puts "T" if fin < 40
    end
end

solution.rb:37:in `+': no implicit conversion of nil into String (TypeError)
	from solution.rb:37:in `<main>'