Answer:
$325
Step-by-step explanation:
if the refrigerator has been marked UP by 25%, this means that $406.25 is 125% of the original price (the original price being 100%).
Therefore, divide 406.25 by 125 to find the cost per 1%, then multiply by 100 to find the original price.
(406.25 ÷ 125) x 100 = 325
x = 50
10x + 300 = 800
subtract 300 from both sides
10x = 500
divide each side by 10
14.6 lbs/4 weeks = 3.65 lbs /week
she lost 3.65 pounds each week