[Rails] rails float type number does not work right

[蕲春人]

    it "should get right settlement percent" do
      contract = Contract.new
      contract.settlement_percent = 1.1 / 100.0
      contract.settlement_percent.to_f.should == 0.011
      contract.settlement_percent.to_s.should == "0.011"
    end

but test result is :

Failure/Error: contract.settlement_percent.to_f.should == 0.011
     expected: 0.011,
          got: 0.011000000000000001 (using ==)
     # ./spec/models/contract_spec.rb:16:in `block (3 levels) in <top
(required)>'

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