How do I solve this problem?

Janine is considering buying a water filter and a reusable water bottle rather than buying bottled water. Will doing so save her money? First, determine what information you need to answer this question, then click here to display that info (along with other info). Which option is cheapest over one year (365 days)? Select an answer The cheapest option saves her $ over a year. Give your answer to the nearest cent. Pro-rate the costs (so if you only use half of a filter pack, only count half the cost)