Question

$85.00 and 5.3% sale tax what’s the total ?

Answer 1

the total is `$89.51`

Explanation:

First you set up a proportion :

`x/85 = 5.3/100`

Then you cross multiply, which gives you

`100x = 450.5" "larr(85xx5.3)`

Divide: `450.5/100 = 4.505" "` this is `5.3%`

Add that to `85`.

You obtain the answer `89.505` but you round the hundredths to have `$89.51` as your final answer.

Answer 2

`$89.51`

Explanation:

There are two methods:

Find `5.3%` of `$85.00` and then add it to `$85.00`

`5.3/100 xx 85 = 4.505" "larr` the amount of sales tax

Total`= $85+$4.51 = 89.51" "larr` rounded to 2dp for money

Or

Realise that `100%+5.3% = 105.3%`

Find `105.3%` of `$85` to get the final answer immediately.

`105.3/100 xx85 = $89.51" "larr` rounded to 2dp for money