8 white tiles, and they cost 12 altogether.
Lets set up a proportion.
8/12 = 1/x Proportion is here.
Now, cross multiply
8x = 121 Multiply
8x = 12 Result
8x/8 = 12/8 Divide both sides by 8.
x = 12/8 x equals 12/8
x= 1.5 x equals 1.5
Now, we have our value for x, which is 1.5, and we must add units to complete the answer.
Final answer: $1.5 per white tile