How to calculate the decrease in rest mass in a nuclear fusion reaction?

In a nuclear fusion reaction two 2H atoms are combined to produce 4He. Taking M(2H)=2.0414102 u and M(4He)=4.006202 u calculate the decrease in rest mass in unified mass unitsHow to calculate the decrease in rest mass in a nuclear fusion reaction?
2 * M(H鈫?) = 2 * ( 2.0414102 u ) = 4.0828204 u


Decrease in rest mass is


螖M = M(4鈫慔e) - 2 * M(H鈫?) = 4.006202 u - 4.0828204 u = - 0.0766184 u