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welcome to math with mr j

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in this video i'm going to cover how to

calculate sales tax and then the final

price with that tax included let's jump

into our examples and see exactly how we

do this starting with number one where

we have a price of 75 dollars and then a

sales tax rate of 8 percent now i do

want to mention that sales tax rates

vary by country and state and then there

can be local taxes that are included as

well this video does not cover a

specific location sales tax these are

general numbers being used to show how

to calculate sales tax so the first

thing that we want to do is to calculate

how much sales tax we will be paying we

do this by multiplying the price

by the tax rate the tax rate is going to

be in the form of a percent

we want to get this percent to decimal

form percent means per 100 so we divide

the percent by 100 to convert it to a

decimal we can do this by simply moving

the decimal twice to the left so percent

to decimal move the decimal twice to the

left that gives us a decimal equivalent

to the percent so for number one we have

eight percent let's move that decimal

twice to the left i'm going to rewrite

eight percent underneath here so i have

enough room

now for a whole number the decimal comes

after a whole number so it's right here

for 8 percent

once

twice to the left

so we have

0.08

for decimal form there so we need to

take our original price of 75

75 here

and multiply that

by

0.08

now if you are using a calculator with a

percent button you can also do

75

times

8 percent so you can leave it in percent

form just make sure you hit that percent

button do not do 75 times eight so

either one of those will give us the

correct answer as far as how much we are

paying in sales tax so 75 times .08

that's going to give us

six dollars

now 75 times eight percent that gives us

the same

answer

of six dollars so that's how much we are

going to pay in tax so once we have that

information we take our original price

and add that sales tax to give us our

final price make sure you add that sales

tax so we have i'll write this out by

hand we have 75 dollars

plus

six dollars

so that's going to give us a total price

with tax included of 81

dollars

let's move on to number two where we

have 349.99

for our price and then a sales tax rate

of

6.75

let's convert that sales tax rate to a

decimal move the decimal twice to the

left so i'm going to rewrite this

underneath here so we have enough room

and move it once

twice

so we have

.0675

for our decimal so let's multiply that

by our original price of 349.

and 99 cents

decimal form of .0675

now we can also do this using the

percent button on a calculator so i'll

write that out just to be clear here

so we can do 349.99

times

6.75

percent

and these are both going to give us the

correct answer of

now for this one we get

a fairly long decimal so 6

2

4

3

2

5.

i'll write that out for both here

now we are working with money so money

always goes to the hundredths place so

if you get a long decimal like this we

round to the hundredths place so this

two here in the hundredths look next

door and we stay the same so this is

going to round to

let me rewrite it underneath

23.

and 62 cents so that's going to be how

much we are going to pay in sales tax

once we have that information we add it

to our original price

i'll write this out so we have 304

dollars

and 99 cents

plus

23 dollars

and 62 cents

let's add here

9 plus 2 is 11

1 plus 9 is 10 plus 6 is 16 bring our

decimal straight down

1 plus 9 is 10 plus 3

is 13

1 plus 4 is 5

plus 2 is 7

and then we have a 3 in the hundreds

place

so our final price with sales tax

included is going to be

373

and 61 cents

so there you have it there's how you

calculate sales tax take that original

price and multiply it by the tax rate

either in decimal form or use the

percent button on a calculator that's

going to give you how much you're going

to pay in sales tax once you have that

information you take the original price

and add that sales tax

to get the final price

i hope that helped

thanks so much for watching

until next time

peace

you