def takyBlock(p1)
    if block_given?
        yield(p1)
    else
        p1
    end
end
takeBlock("no block")
takeBlock("no block") {|s| s.sub(/no /, '')}

class TaxCalculator
    def initialize(name, &block)
        @name, @block = name, block
    end
    def getTax(amount)
        "#@name on #{amount} = #{ @block.call(amount) }"
    end
end

tc = TaxCalculator.new("Sales tax") {|amt| amt * 0.075 }
tc.getTax(100)
tc.getTax(250)