Percentage

Calculating percentages: Percentages are interesting to calculate. We convert the multiplication into addition. That's it.

Just consider numbers 1, 2, 5, 10, 20, 50,100. Can you see anything? Yes they are the denominations of Indian currency. These are enough to calculate any percentage values directly.

for 1%: divide the given number by 100.
for 10%: divide the given number by 10.
for 100%: It is the actual given number.

for 2%: divide the given number 100 and multiply by 2 or just divide the given number by 5 and then divide by 100.
for 20%: divide the given number 10 and multiply by 2 or just divide the given number by 5 and then divide by 10.
for 200%: It is the actual given number multiplied by 2.

for 5%: divide the given number 100 and multiply by 5 or just divide the given number by 2 and then divide by 100.
for 50%: divide the given number 10 and multiply by 5 or just divide the given number by 2 and then 10.
for 500%: It is the actual given number  multiplied by 5.

For your number: 25.6% of 488

26.5 = 25 + 1 +.5

25% of 488 = 488/4 = 122.[Because 488 * 25/100 => 488*1/4]

1% of 488 = 488/100= 4.88

.5% of 488 = 488/200 = 2.44

Now add all the values.It gives 129.32 which is the answer. If you wanna calculate 3% find 1% and multiply it by 3. If you wanna calculate 7% calculate 5% and add 2%. That's it.