I need help with this economic question

In 2000, Bell Atlantic and GTE merged to form a giant telecommunications corporation named Verizon Communications. As expected, some equipment incompatibilities had to be rectified, especially for long distance and international wireless and video services. One item had two suppliers, a U.S. firm (A) and an Asian firm (B). Estimates for vendors A and B were given for each unit. Determine which vendor should be selected if the MARR is 15% per year