Computing Percent Savings

We love to get discounts whenever we buy something. Know first hand how much you are about to save for a given amount of percent off sale with these mental tricks.

Example, a shirt with a price of 300 Php with a given % sale.

For 10%, moving 1 decimal point, 300 becomes 30.
10% of 300 = 30 Php.

For 5%, that's half of 10% savings.
5% of 300 = 30/2 = 15 Php.

For 15%, add the 10% and 5% savings.
15 % of 300 = 30 + 15 = 45 Php.

For 20%, that's twice of 10% savings.
20% of 300 = 30x2 = 60 Php.

For 25%, add 20% and 5% savings.
25% of 300 = 60 + 15 = 75 Php.
Or take 1/4 of the price. To make it simple, divide by 2 twice.
25% of 300 = 300/2 = 150/2 = 75 Php.

For 30%, that's 3 times of 10%.
30% of 300 = 30x3 = 90 Php.

For 35%, add 30% and 5% savings.
35% of 300 = 90 + 15 = 105 Php.

For 40%, multiply 10% savings with 2 twice.
40% of 300 = 30x2 = 60x2 = 120 Php.

For 45%, add 40% and 5% savings.
45% of 300 = 120 + 15 = 135 Php.

For 50%, that's half of the price.
50% of 300 = 300/2 = 150 Php.

More examples:

10% of 985 = 98.5
15% of 280 = 28 +14 = 42
20% of 740 = 74x2 = 148
25% of 460 =  460/2 =230/2 =115
30% of 1500 = 150x3 = 450
35% of 600 = 60x3 + 30 =210
40% of 240 = 24x2 = 48x2 = 96
45% of 240 = 96 + 12 = 108
50% of 649 = 649/2 = 324.5

#Matamata