Before cell phones came along and unlimited long-distance calling packages were widely available. long-distance carriers offered competitive calling plans. at& t introduced their "dime-line". customers paid a monthly fee of $5 plus only 10 cents per minute of long-distance calling time. sprint offered a plan in which customers simply paid 30 cents per minute with no monthly fee. how many minutes of long-distance time make the customer charges equal? which plan would be more beneficial to a small business that dealt with clients across the country? explain your answer.