In: Accounting
The present value of the costs of carrier A = $ 200 + $ 60
1.041
+  $ 60 
1.042
+  $ 60 
1.043
+  $ 60 
1.044
+  $ 60 
1.045
+  $ 60 
1.046
+  $ 60 
1.047
+  $ 60 
1.048
+  $ 60 
1.049
+  $ 60 
1.0410
+  $ 60 
1.0411
+  $ 60 
1.0412
+  $ 60 
1.0413
+  $ 60 
1.0414
+  $ 60 
1.0415
+  $ 60 
1.0416
+  $ 60 
1.0417
+  $ 60 
1.0418
+  $ 60 
1.0419
+  $ 60 
1.0420
+  $ 60 
1.0421
+  $ 60 
1.0422
+  $ 60 
1.0423
+  $ 60 
1.0424
The present value of the costs of carrier A = $ 1,114.82
The present value of the costs of carrier B = $ 100 + $ 70
1.041
+  $ 70 
1.042
+  $ 70 
1.043
+  $ 70 
1.044
+  $ 70 
1.045
+  $ 70 
1.046
+  $ 70 
1.047
+  $ 70 
1.048
+  $ 70 
1.049
+  $ 70 
1.0410
+  $ 70 
1.0411
+  $ 70 
1.0412
The present value of the costs of carrier B = $ 1,513.91
Thus you should choose carrier A because the present value of the costs of carrier A is less than the present value of the costs of carrier B.