A store offers a 15% discount on a freezer chest that was originally priced at $630. If the sales tax rate is 7.8%, how much must you pay to buy the freezer chest?

$577.27

Step-by-step explanation:

When offered 15% discount, buyer will then pay 100-15=85% of the original price hence the price offered by seller will be

0.85*$630=$535.5

Now this price is subjected to a tax of 7.8%, equivalent to 0.078 hence the buyer pays 1.078 of $535.5

1.078*$535.5=$577.269

Rounded off, this is equivalent to $577.27

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this