Answer:
1. Tori charges $5.60 per painted frame.
2. The percent markdown is 60%
3. The price of a beef taco on Tuesday is $3.06
Explanation:
1.) 40% = .4
.4 x 4 = 1.6
1.6 + 4 = 5.6
2.) 9 + x = 15
9 + 6 = 15
15 x .6 = 9
3.) 3.6 x .15 = .54
3.6 - .54 = 3.06