A$78.00 pair of shoes cost $84.63 after tax is added. what percentage of the cost is tax?
a) 8.0%
b) 8.25%
c) 8.5%
d) 8.75%

C) 8.5%

Step-by-step explanation:

First, subtract the cost after tax to the cost before tax.

84.63 - 78.00 =

6.63

Then, divide the original cost from this

6.63 / 78.00 =

0.085

When reading percentages on a calculator, we know this is equivalent to 8.5%

Hope this helps! :)

f(x) has value 150 at x= 0

and 0 at x= 3

so d(f(x))/dt = slope = -150/3 = -50

1. 3.4/4

2. 0.8/7

3. 0.5 x 3

4. 0.9 x 6

5. 10.8

6. 2.35

7. 0.567

8. 9.35

9. 0.02

10. 0.06

11. 0.16

12. 0.42

13. 0.63

14. 5.6

15. 8.1

16. 9.9

17. 0.28

18. 0.48

19. 0.27

20. 0.49

21. 0.45

22. 0.72

23. 0.9

24. 0.88

25. 0.75

26. 0.16

27. 0.328

28. 0.495

29. 0.72

30. 1.068