The correct option is A 40 years
Given, ₹810 is the simple interest being generated on ₹450.
Let the time taken be t years.
We know, S.I=P×r×T100
where, S.I = simple interest
P = principal
r = rate of interest and
T = time
⇒810=450×4.5×t100
⇒t=(100×810450×4.5) years =40 years
So, it will take 40 years for an amount of ₹450 to yield ₹810 as interest at 4.5% per annum of simple interest.