human
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?
assistant
How much does the balloon increase in the first hour? ** 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
What will the balloon's volume be after the first hour? ** After the first hour, it will have a volume of (500+200)cm³ = <<(500+200)=700>>700cm³
How much does the balloon increase in the second hour? ** In the second hour, it will increase in volume by two-fifths of 700cm³ which is (2/5)*700cm³ = <<2/5*700=280>>280cm³
What will the balloon's volume be after the second hour? ** After the second hour, it's volume will be (700+280)cm³ = <<(700+280)=980>>980cm³
#### 980