conversations.from: human
conversations.value: Pima invested $400 in Ethereum. In the first week, it gained 25% in value. In the second week, it gained an additional 50% on top of the previous gain. How much is her investment worth now?
  Give me a detailed solution.
conversations.from: assistant
conversations.value: For the first week, her investment gain is $400 * 25% = $100.
  This leaves her investment with a value of $400 + $100 = $500.
  For the second week, her investment increased by $500 * 50% = $250.
  Pima's investment in Ethereum is now worth a total of $500 + $250 = $750.