Question

Someone tell me the anwser and i need to show my work too

Answer 1

Original cost $18.50

20% off.

20% of 18.5 = (20/100)*18.5 = 0.2*18.5 = 3.7

So 3.7 needs to be taken off from 18.5

18.5 - 3.7 = 14.8

So the new sale price = $14.80

Since the sale tax is 6.75% =  6.75% of 14.80 = (6.75/100) * 14.8

                                                                               = 0.0675* 14.8 = 0.999
Sales tax ≈ 1.00

So final price = Sale price + Tax = $14.8 + $1.00 = $15.80
 
Hope this helps.

Answer 2

First you need to find how much 20% of $18.50 is. To do this, you need to multiply 18.50 by 20% which in decimal form is 0.2
$18.50x0.2=$3.70
Now you need to subtract $3.70 from $18.50
$18.50-$3.70=$14.80
Now that you have the new price, you need to find 6.75% of it to get the sales tax, so you multiply $14.80 by 6.75%, which is 0.0675 as a decimal.
$14.80x0.0675=$0.999 or $1 
Now you add the sales tax to $14.80
$14.80+$1=$15.80 or $14.80+$0.999=$15.799