sum the Item iif and irf as well as the Bundle tif and trf

app/models/bundle.py

@@ -21,3 +21,19 @@ class Bundle(BaseModel):
     def trf(self, irt_model: IRTModel, theta: float) -> float:
         return TestResponseFunction(irt_model).calculate(self.items,
                                                          theta=theta)
+
+    def tif_sum(self, solver_run):
+        total = 0
+
+        for target in solver_run.objective_function.tcc_targets:
+            total += self.tif(solver_run.irt_model, target.theta)
+
+        return total
+
+    def trf_sum(self, solver_run):
+        total = 0
+
+        for target in solver_run.objective_function.tcc_targets:
+            total += self.trf(solver_run.irt_model, target.theta)
+
+        return total