Answer:
Option c. 17%
Step-by-step explanation:
Data provided in the question:
Amount paid on food last year = 12% of Annual after tax income
Amount paid on food for the current year = 10% of Annual before tax income
Now,
Let the after tax income be 'x'
and tax be 'y'
Therefore,
Income before tax = x + y
Amount paid on food = 12% of x
According to the question
12% of x = 10% of (x + y)
or
0.12x = 0.10 (x + y)
or
1.2x - x = y
0.2x = y
or
x = 5y
Thus,
percent of the family's annual before-tax income that was paid for tares last year
= [Tax ÷ Income before tax] × 100%
= [ y ÷ ( x + y )] × 100%
= [ y ÷ ( 5y + y )] × 100%
or
= 0.167 × 100% ≈ 17%
Hence,
Option c. 17%