please show me the explanation for each answers:

question1:

Nominal monthly wages increase from $1,500 to $1,800 while the price of a car increases by 4%. The percentage change in real monthly wages (in terms of cars) is about...( please show me the formula)

Multiple Choice

• 10%
• 12%
• 14%
• 16%

question 2:

If prices rise by 4% in a year and nominal wages increase by only 2%, then real wages will...

• decrease by 6%.
• decrease by 4%.
• decrease by 2%.
• increase by 2%.

question 3:

If the nominal wages of carpenters rose by 5% in 2013 and the price of hammers increased by 3%, then the real wages (in terms of hammers) of carpenters

• decreased by 2%.
• increased by 2%.
• increased by 3%.
• increased by 8%.