Compute the performance of three ideal turbofan engines

Question

Question Compute the performance of three ideal turbofan engines with an ideal turbojet engine at two flight conditions. The first flight condition (case 1) is at Mach number 0.9 and 40,000ft. The second (case 2) is at Mach 2.6 and 60,000ft.

The following are given: Π_c = 20, T_t4 = 3000 °R, c_p = 0.24 Btu /(lbm °R), γ = 1.4, h_pR = 18400 Btu / lbm.