Ask your parents about it if they didn't help you can copy mine,
Well I asked my parents about they told me that around their age there weren't lots of facilities they even rarely saw transportation facilities like cars and bikes there were no proper internet facilities e.t.c
When I said them what were the changes in the last 25 years they said there were drastic changes including social, economic, science, transportation, health e.t.c and many more
It would be greater as 67 rounded up is 70 and 36 rounded up is 40 thus, you are multiplying two larger numbers than in your original equation which will result in a larger product.