prompt: A special balloon increases by two-fifths of its previous volume every hour when placed under water. If its original volume is 500cm³, what will its volume be after 2 hours underwater?
messages.content: A special balloon increases by two-fifths of its previous volume every hour when placed under water. If its original volume is 500cm³, what will its volume be after 2 hours underwater?
messages.role: user
messages.content: In the first hour, the balloon will increase in volume by two-fifths of 500cm³ which is (2/5)*500cm³ = <<2/5*500=200>>200cm³
  After the first hour, it will have a volume of (500+200)cm³ = <<(500+200)=700>>700cm³
  In the second hour, it will increase in volume by two-fifths of 700cm³ which is (2/5)*700cm³ = <<2/5*700=280>>280cm³
  After the second hour, it's volume will be (700+280)cm³ = <<(700+280)=980>>980cm³
  #### 980
messages.role: assistant