sth about tax

rushcynthia

5.the costs $54.64,exclusive tax.$0.79 is added, at 5% tax rate to the taxable items. The untaxed costs=?
38.84

I can not totally understand those descriptions,especially"$0.79 is added",add to what?(tax or cost)?

sandcastle

0.79 is added to costs.
costs=taxable costs + untaxable costs=54.64
taxable costs * 5%=0.79
untaxed costs=54.64-0.79/0.05=38.84

arrymin

agree with sandcastle

isenetlab12

Since someone said
     total cost =taxable cost + tax+untaxble cost
     taxable cost *5%=tax=0.79 then taxable cost=15.8
then untaxable cost=54.64-15.8-0.79=38.05
So why 38.84?

sumer02618

isenetlab12:
根据题目，54.64是excluding tax的cost.所以没有必要再减0.79了。

lisaislisa

to isenetlab12:
54.64 is cost excluded tax , does not necessary to minus tax payment
simple 54.64-15.8

^^

rushcynthia

so that is to say :"exclusive tax.$0.79 is added, at 5% tax rate to the taxable items",is one sentence and there should not be a fullstop between "tax"and "$0.79",right?
thanks