At the january weigh-in for feeder calves, jason's calf weighed 300 lbs and erica's calf weighed 400lbs. during the fair jason's calf weighed 390 lbs and erica's calf weighed 500 lbs. why can they both claim their calf gained more?

Jackson earns $25 per hour as a tutor at the college library. he set a weekly spending budget of $130 each week and puts the remaining money in his savings account. how many hours must he work this week to have at least an extra $50 to put in his savings account