Logan and Rita each open a savings account with a deposit of $8,100. Logan's account pays 5% simple interest annually. Rita's account pays 5% interest
compounded annually. If Logan and Rita make no deposits or withdrawals over the
next 4 years, what will be the difference in their account balances? i will give brainliest please HELP ME

The weekly amount spent by a company for travel has an approximately normal distribution with mean = $550 and standard deviation = $40. a) what is the probability that the actual weekly expense will exceed $570 for more than 20 weeks during the next year? (note: one year = 52 weeks) b) what is the probability that actual weekly expenses exceed $580 for 10 or more, but 16 or fewer weeks during the next year?