how do you increase an amount buy 10%?

% are number of what u want procent times number of procent div 100
===

u have 300$ and 10% of 300 is 300*10/100 equals 30

new price is 300+30=330

10 % of 300 = 0.10(300) = 30
300 + 30 = 330 (300 increased by 10%)

10% of 300= 30.
300+30= 330.

300 x (1 + 10%)
= 300 x (100% + 10%)
= 300 x 110%
= 300 x 110/100
= 300 x 11/10
= 3300/10
= 330

100 % <----------> 300
10 % <-----------> 30

new amount = 330

Multiply it by 110% or 300 x 1.10 = 330.

10 per cent is 100 divided by 10 - which in this case leaves you with 10

take 300 and divide it by 10 leaving you with 30.
add the 30 to the 300 to increase it by this amount giving you 330.

if it was 20% => it would be 360

Jerome is right.I am with him

multiply 300 by .1
add the result to 300
330