<prompt> Increase in height in first year is by40506075  <response>: Length at bih- 50 cms, while at the end of 1st year, it is 75 cms, i.e., height increases by 25cms, which will be 50 50 of 50cms at bih will be 25cms, and by adding this 25cms to 50cms itll account to 75 cms at the end of 1yr Ref: Nelsons 20th edition, pg 84-89 