Chapter: Simple linear equations Answer in steps

6x-3=21

6x=24

x=4

6x+27=39

6x=39-27

6x=12

x=2

8x-10=14

8x=24

x=3

6+6x=22

6x=22-6

x=3

12x-2=28

12x=26

x=3

8-4x=16

-4x=8

x=-2

4x-24=3x-3

4x-3x=24-3

x=21

9x+6=6x+12

9x-6x=12-6

3x=6

x=2

Total number of T-shirts= 200

Cost per T-shirt (without shipping ) = $2.80

Shipping cost per t-shirt ; 5% of a T-shirt = 0.05 *2.80 = $0.14

Total cost of T-shirt (shipping included) = 2.80 +0.14 = $2.94

Markup = 150% of total cost = 1.50 * 2.94 = $4.41

To get the price at which Michelle will sell each T-shirt , add total cost  to the markup; 2.94 +4.41 = 7.35.

Therefore, selling price will be $7.35