Use the atomic masses 4.002603 u for helium-4 and 15.994915 u for oxygen-16, with mH = 1.007825 u…

Step 1. Helium-4. The parts are $2 \times 1.007825\ \text{u} + 2 \times 1.008665\ \text{u} = 4.032980$ u. So $\Delta m = 4.032980\ \text{u} - 4.002603\ \text{u} = 0.030377$ u, and $B = 0.030377\ \text{u} \times 931.494\ \text{MeV/u} = 28.30$ MeV. Then $B/A = \dfrac{28.30\ \text{MeV}}{4} = 7.074$ MeV.

Step 2. Oxygen-16. The parts are $8 \times 1.007825\ \text{u} + 8 \times 1.008665\ \text{u} = 16.131920$ u. So $\Delta m = 16.131920\ \text{u} - 15.994915\ \text{u} = 0.137005$ u, and $B = 0.137005\ \text{u} \times 931.494\ \text{MeV/u} = 127.6$ MeV. Then $B/A = \dfrac{127.6\ \text{MeV}}{16} = 7.976$ MeV.