The cost of eight stress balls and five T-shirts is $111.75. The cost of twelve stress balls and four T-shirts is $102.00. What is the cost of one T-shirt? (A) $9.75 (B) $12.50 (C) $17.75 (D) $18.25 (E) $18.75

Let's say stress ball cost x and t shirt cost y

8x+5y=111.75

12x+4y=102.00→3x+y=25.5→y=25.5-3x

8x+5 (25.5-3x) = 111.75

8x+127.5-15x=111.75

-7x=-15.75

x=2.25

12x+4y=102

12 (2.25) + 4y=102

27+4y=102

4y=75

y=18.75

d is the correct answer