how to add 6% sales on 49.80?

1.06*49.8=52.788.
Thanks.

49.8 x (1 + 6%) (1 = 100%)
= 49.8 x 106%
= 49.8 x 106/100
= 5278.8/100
= 52.788
≈ 52.79

49.80+6%= 49.80+(0.06x49.80)
=52.788
=52.79

100%<-------->49.80
1%<----------->0.498
6%<----------->2.988

Total
49.80
02.988
---------
52.788
---------

£ , $ , € , yen ???? !!!!

Do it in your head. .06x50 equals 3 so 52.80 - close enough

Find 6%, then add it to the price. 6% as a decimal is 0.06, so multiply this by the initial price, $49.80

0.06 * 49.8 = 2.988, So about $3

Now add them, you get 49.8 + 2.988 = 52.788

You probably want to round to $52.79

step by step method:
6 percent means 6/100
so 49.8 X 6/100 = 2.988
which means the increase of 6% is 2.988
so to add 6% just add 2.988 to 49.8
u shall get 52.788

or u can jst do this
49.8 X 1.06

49.80 x.06 = 2.99
49.80 +2.99 = 52.79

or in one step
49.80 * 1.06 = 52.79

Multiply 49.80 by 0.06 and add the result to 49.80

1.06 * 49.80 = 52.788
round up = 52.79