What is the answer to

decrease 2500 by 1%

2500 (100-1) / 100

2500 (99/100)

2500 (0.99)

2475

1st Method; the value 1% of 2500 is 1% x 2500 = 0.01 x 2500 = 25

This is a decrease, then it's - 25

2nd Method:

The 2500 represents 100%. If we have to decrease it by 1%, then the remainder value in % will be 100% - 1% = 99%. The value of 99% is:

2500 x 99% = 2500 x 0.99 = 2475

From 2500 it becomes 2475 after the decrease of 1%. Inn value the decrease is 2500 - 2475 = 25