Company a offers a starting salary of $28,000 with a rate of 3000 each year company b offers a starting salary of $36,000 with a raise of $2000 per year company c offers a starting salary of $80,000 .after how many years would the salaries company a and b be the same ? how much of a raise per year would company c have to offer to equal the salaries of companies a and b in the year in which the salaries of those two companies be the same