Hi if my check was $45.99 & I want to leave 20% of tip, who do I do that in math?

Question

And also if I buy a meal that cost $19.99 & I get 70% off, how much do I pay?

Can you teach me on math & basics? Thank you for your kindness!!! :)

In English please....:)

Answer 1

when its a nice easy percentage like 20% for the meal, easiest way is divide bill by 10 and multiply that by 2, that gives you 20%, as for the 70% divide by 10 again and multiply by 7

dividing by 10 gives you 10%

for example

bill $45.99 divide by 10= $4.59
multiply by 2 = $9.18

then add them together $45.99+$9.18=$55.17

in this case leave $55, you round it up or down a bit to the easiest amount, in the case of a tip you dont need to be precise, in math you obviously need to be exact

Answer 2

The easiest way to do this type of math is to divide the the first number by 10. For example: 45.99 divided by 10 is 4.599. Now since you would like to know what 20% is, you now multiply 4.599 (which is 10 percent) by 2, i.e. 4.599 x 2 and your answer is 9.198.

Here is how it looks on paper:

45.99 / 10 = 4.599 (10 percent)
4.599 x 2 = 9.198 (20 percent)

I would round the numbers to make it easier to compute.

46 / 10 = 4.60 (10%)
4.60 x 2 = 9.20

Don't forget to put the $ sign back $9.20.

As to the 2nd problem. You begin the same way as your question about how to determine 20%.

$19.99 / 10 = $1.999 (which we will round to $2)

Now you have two choices. You can compute
$2 x 7 = $14

which is your discount (70%) and then subtract that amount from $19.99 or you can determine the answer by determining what is 30% (100% - 70%) of $19.99 (which is your final price).

Here is the math:

$19.99 / 10 = 1.999 ($2)
$2 x 3 = $6

(this is the price you will pay after the 70% discount)

or

$19.99 / 10 = 1.999 ($2)
$2 * 7 = $14 (this is the 70% discount)
$19.99 - $14 = $5.99 (or $6)

Answer 3

20% is the same as 20 / 100 or 0.2

therefore: 20% of 45.99 is (45.99 x 0.2) = 9. 198
So, you would leave $9.20 as the tip
Similarly, 20% x 5 = 100%
therefore, 9.198 x 5 should = 45.99, which it does.

If a meal costs $19.99 and you get 70% off:
the whole price - 70%
therefore, it is 19.99 - (19.99x 0.7) = 19.99 - 13.993
= 5.997
So, you only pay $6 (if you round it off - money can only be represented to 2 decimal places)

Answer 4

1) What is the total amount for a check of $45.99 plus a 20% tip?

1.2 * $45.99 = $55.19
_________________

2) If a meal normally costs $19.99, how much does it cost when it's 70% off?

(1 - .70) * $19.99 = .3 * $19.99 = $6.00

Answer 5

Just round it off to $46 and take 10% of that,which is easy to do in your head, which would be $4.60, and then x 2=$9.20. Even if you are off a few cents, you know it is at least $9.00, and just leave that.

If you are getting 70% off something, just round that $19.99 off to $20.00, and you know that you are only paying 30%, so 3X2=$6.00, so 70% of $20, would be $6.00....you can do this in your head, but just remember that it has to make sense, and like the 70% off, or 50% off, which is 1/2 of the amount, just take the amount that you would be paying,and work with that number. 60% off would be 40% of what you would be paying, so $20.00 less 40%= $8.00 (2x4)=8

Answer 6

2o% is 1/5,so you divide 45.99 by 5 =$9.20 just remember a percent is like a penny (1/100th)of a dollar,so 70% off is 70 cents per dollar. you pay 30 cents/$ ,answer $6.00 30 x 20

Answer 7

check = 45.99
20% tip = 20% of 45.99 = 9.18

to pay = 45.99+9.18 or 55.17

meal = 19.99

off = 70%
so to pay 30% = 19.99*30% or around $6

Answer 8

Round it up to $46.
10% would be $4.60
Take that times 2 to get 20% which is $9.20

Again, I'd round up to $20
10% of that would be $2
Take that times 3 to get 30% (which is what you pay if it's 70% off) and you get $6.00

Hope that helps!

Answer 9

(45.99)(.20)=9.918