A gallon of milk cost $2.79 in 2000. In 2020, in cost $3.98
i just need help with the percent proportion and the solution.

From the information we have, the original price is 825 $. We now need to calculate 1/4 of that price, so:

1/4 * 825

825/4 = 206.25

Mark also wanted to use the 1/5 coupon off the sale price, so we calculate this:

1/5 * 825

825/5 = 165

Now  we add both discounts :

206.25 + 165 = 371.25

Now we subtract this from original sale price:

825 - 371.25 = 453.75

He bought the tablet at 453 dollars and 75 cents.