Based on the fact that Jan only bought goods that were marked down, the total percentage discount of Jan's grocery bill is c. 16.65%.
How much percentage discount did Jan get in total?
First find the total discounted price:
= 8.47 + 2.16 + 0.89 + 1.45 + 1.36 + 4.39
= $18.72
Then find the total she would have spent without the discounts:
= 8.47 / (1 - 0.15) + 2.16 / (1 - 0.20) + 0.89 / (1 - 0.1) + 1.45 / (1 - 0.12) + 1.36 / (1 - 0.25) + 4.39 / (1 - 0.18)
= $22.47
The percentage discount is:
= (22.47 - 18.72) / 22.47
= 16.65%
Find out more on percentages at https://brainly.com/question/24304697.
#SPJ2