Here are some practice tax problems:
Cost of item: $50
Sales tax rate: 7%
Method 1:
50 + (50 x 0.07)
50 + 3.50
53.50
Method 2:
50 x 107%
50 x 1.07
53.50
Cost of item: $75
Sales tax rate: 4%
Method 1:
75 + (75 x 0.04)
75 + 3
78
Method 2:
75 x 104%
75 x 1.04
78
Let me know if you need any clarification or have additional questions!