Answer:
Step-by-step explanation:
The answer is: 
The explanation is shown below:
1. To solve this problem you must apply the following proccedure:
2. You have the logarithm expression:

3. First, you must apply the following property:

4. Therefore, you have:

5. By applying logarithm on both sides, you have:

6. By applying the property
:

7. Solve for x:

Answer:
The cost is $100.80
Step-by-step explanation:
100% = $140
72% = sale price
140 x 0.72 = $100.80
3x2 is 6
6+8 is 14
4+7-3 is 8
14/8 is 1.75 or 1 and 3/4