conversations.from: human
conversations.value: Ariella has $200 more in her son's saving account than Daniella has in her son's savings account. Ariella's account earns her simple interest at the rate of 10% per annum. If Daniella has $400, how much money will Arialla have after two years?
  How to solve this?
conversations.from: assistant
conversations.value: If Ariella has $200 more in her son's saving account than Daniella has, then she has $400 + $200 = $600
  If she earns an interest of 10% in the first year, her savings account increases by 10/100 * $600 = $60
  In the second year, she earns the same amount of interest, which $60 + $60 = $120
  The total amount of money in Ariella's account after two years is $600 + $120 = $720