Semper mortgage wishes to select the best of three possible computers, each expected to meet the firm's growing need for computational and storage capacity. The three computers $---$ A$,$ B$,$ and C $--$ are equally risky. The firm plans to use a $12\%$ cost of capital to evaluate each of them. The initial outlay and the annual cash outflows over the life of each computer are shown in the following table:

Cash Outlflows $($CF$1)$

Year $($t Computer A Computer B Computer C

$0-$$$50,000-$$$35,000-$$$60,000$

$17,0005,50018,000$

$27,00012,00018,000$

$37,00016,00018,000$

$47,00023,00018,000$

$57,000-----------------18,000$

$67,000-----------------18,000$

A$.$ Calculate the NPV for each computer over its life. Rank the computers in descending order, based on NPV$.$