Please show step by step on excel.

A WiMAX wireless network integrated with a satellite network can provide connectivity to any location within 10 km of the base station. The number of sectors per base station can be varied to increase the bandwidth. An independent cable operator is considering the three bandwidth alter-natives shown below (monetary values in $1000units). Assume a life of 20 years and a MARR of25% per year to determine which alternative is best using an incremental ROR analysis