conversations.from: human
conversations.value: This math problem has got me stumped: Loisa wants to buy a tablet that costs $450 cash. Since she does not have enough money, the store offered her an installment plan for 12 months. She will pay $100 as a down payment and pay $40 for the first 4 months; then $35 for the next four months; then $30 for the last four months. How much will Loisa save if she will buy the tablet in cash instead of on installment?
  Can you show me the way?
conversations.from: assistant
conversations.value: Loisa will pay a total of $40 x 4 = $160 for the first 4 months.
  She will pay a total of $35 x 4 = $140 for the next four months.
  And she will pay a total of $30 x 4 = $120 for the last four months.
  Thus, she will pay a total of $100 + $160 + $140 + $120 = $520 for 12 months including the down payment.
  Therefore, Loisa can save $520 - $450 = $70 if she buys the tablet in cash.