Someone plz answer these 3 different questions 1.The sales tax on a new Fridge that costs $1800 was $166.50 What is the Sales tax in Percent?

2.The Alvarez's lived in a hours that had area of 1575 square foot. Now they moved to a bigger house that has area of 2100 square foot. What it the percent increase in square foot?

3.The Alvarez's lived in a hours that had area of 1575 square foot. Now they moved to a bigger house that has area of 2100 square foot. What it the percent increase in square foot?

1. $1,633.50

2. +33%

3. +33%

Step-by-step explanation:

To answer the question, let x be the cost of each hamburger, y be the cost of each medium fries, and z be the cost of each medium drink. The equations that are described in the problem are,
       (Miller )        4x + 3y = 18.69
       (James)       x + 2y + z = 8.66
       (Steven)      2x + y + z = 10.27
Solving simultaneously for the values of the variables give x = 3.36, y = 1.75, and z = 1.8. 
Thus, each hamburger costs $3.36. Each medium fries cost $1.75, and each drink costs $1.8.