LAST TRY! MARKING BRAINIEST (only the evens)

2. Necklace

Discount : 95.19 x 0.75 = 71.25

Selling prices: 95.19 - 71.25 = 23.94

4. Book

Markup: 39 x 0.075 = 2.93

Selling price 39 + 39(0.075) = 41.93

6. Car

Markup: 15558 x 0.28 = 4356.24

Selling price: 1558 + 1558(0.28) = 19.914.24

8. 37.99 x 0.076 = 2.89

10. 219 + 219(0.30) = 284.7

12. 479 + 479(0.08) = 517.32

Step-by-step explanation:

2. Necklace

Discount : 95.19 x 0.75 = 71.25

Selling prices: 95.19 - 71.25 = 23.94

4. Book

Markup: 39 x 0.075 = 2.93

Selling price 39 + 39(0.075) = 41.93

6. Car

Markup: 15558 x 0.28 = 4356.24

Selling price: 1558 + 1558(0.28) = 19.914.24

8. 37.99 x 0.076 = 2.89

10. 219 + 219(0.30) = 284.7

12. 479 + 479(0.08) = 517.32

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.