Two models, R₁ and R₂, are given for revenue (in billions of dollars) for a large corporation. Both models are estimates of revenues for 2020 through 2025, where t = 20 corresponds to 2020.

R₁ = 7.22 + 0.27t + 0.02t², R₂ = 7.22 + 0.1t + 0.01t²

Which model projects the greater revenue? The model R₁ projects greater revenue than R₂. The model R₂ projects greater revenue than R₁. The model R₁ projects the same revenue as R₂.

How much more total revenue does that model project over the six-year period? (Round your answer to three decimal places.) $ billion