Answer:
1.25a
Explanation:
Original value = a
An increase of 25% can be found by a x 25/100 = 0.25a
The resulting increased value = Original value + Increase in value
= a + 0.25a
= 1.25a
Sometimes it is a more direct approach to use the final value as original value(1 + increase%/100) in which case it would be a(1+25/100) = a(1 + 0.25) = a(1.25) = 1.25a