Answer:2500
Explanation:
The Amount increases to 2800 after 2 years
it increases 3250 after 5 years
so , in 3 years it increased ( 3250-2800) = 450 rupees.
in 3 years it increased 450
so in 1 it increased 150
according to the problem the sum amounts to 2800 rupees
so in 2 years it increased (150*2)=
300 rupees ,
So the sum was (2800-300) =
2500 rupees